Installation and Operation Manual RTU-292 RADIO / TELEPHONE INTERFACE UNIT Designed and Manufactured by: JPS Communications, Inc. 5800 Departure Drive Raleigh, NC 27616 e-mail: jps@jps.com JPS P/N 5970-600200 Revision 1.62 1 July, 2005 JPS Communications, Inc.
RTU-292 Operations Manual Warranty JPS Communications, Inc. warrants its manufactured equipment to be free from defects in materials and workmanship, and to conform to published specifications for a period of 18 months from the date of shipment from the factory or 12 months from installation, whichever occurs first. JPS warrants its service work performed in connection with this warranty to be free from defects in materials and workmanship for a period of 90 days from the date the work is performed.
RTU-292 Operations Manual Table of Contents 1 GENERAL INFORMATION ...................................................................................................................... 1-1 1.1 SCOPE .................................................................................................................................................... 1-1 1.2 DESCRIPTION....................................................................................................................................... 1-1 1.
RTU-292 Operations Manual 3.1 GENERAL ..............................................................................................................................................3-1 3.2 FRONT PANEL CONTROLS, INDICATORS AND CONNECTORS .................................................3-1 3.2.1 MAIN POWER SWITCH ...............................................................................................................3-1 3.2.2 HEADPHONE JACK................................................................
RTU-292 Operations Manual 4.2 FRONT PANEL BUTTONS AND INDICATORS.............................................................................. 4-19 4.3 MAIN BOARD ..................................................................................................................................... 4-19 4.3.1 AUDIO BUS ARRANGEMENT.................................................................................................. 4-19 4.3.2 TELEPHONE INTERFACE CIRCUITS.............................................
RTU-292 Operations Manual 5.4.15 Time/Date Response......................................................................................................................5-17 5.4.16 Version Response ..........................................................................................................................5-17 5.5 CALL PROGRESS RESPONSES FROM THE RTU-292 ...................................................................5-18 5.6 RESPONSE ERROR CODES..............................................
RTU-292 Operations Manual List Of Figures FIGURE 2-1 FIGURE 2-2 FIGURE 2-3 FIGURE 2-4 FIGURE 2-5 FIGURE 2-6 FIGURE 6-1 FIGURE 6-2 FIGURE 7-1 FIGURE 7-2 FIGURE 7-3 FIGURE 8-1 FIGURE 8-2 FIGURE 8-3 FIGURE 8-4 FIGURE 8-5 FIGURE 8-6 FIGURE 8-7 OUTLINE DIMENSIONS ................................................................................................................... 2-18 CONTROL AND CONNECTOR LOCATIONS .......................................................................................
RTU-292 Operations Manual List of Tables TABLE 1-1 TABLE 1-2 TABLE 1-3 TABLE 2-1 TABLE 2-2 TABLE 2-3 TABLE 2-4 TABLE 2-5 TABLE 2-6 TABLE 2-7 TABLE 2-8 TABLE 2-9 TABLE 2-10 TABLE 2-11 TABLE 2-12 TABLE 2-13 TABLE 2-14 TABLE 2-15 TABLE 2-16 TABLE 2-17 TABLE 2-18 TABLE 2-19 TABLE 2-20 TABLE 3-1 TABLE 3-2 TABLE 5-1 TABLE 5-2 TABLE 5-3 TABLE 5-4 TABLE 6-1 TABLE 7-1 TABLE 7-2 TABLE 7-3 TABLE 7-4 TABLE 7-5 TABLE 7-6 TABLE 7-7 TABLE 7-8 TABLE 7-9 EQUIPMENT AND ACCESSORIES SUPPLIED .................................
RTU-292 Operations Manual Glossary Adaptation The process whereby the RTU-292 DSP algorithms detect reflected signal information in a connected line and tune the DSP hybrid for a broadband null with minimum reflection. COR Carrier Operated Relay - A receiver signal that gives a positive indication that a carrier or signal is being received and that the receiver is unsquelched. Same as COS. COS Carrier Operated Squelch - See COR. CTCSS Continuous Tone Controlled Squelch System.
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RTU-292 Operations Manual 1 General Information 1.1 SCOPE This instruction manual provides the information necessary to install, operate, repair and maintain the RTU-292 Radio/Telephone Interface. 1.2 DESCRIPTION 1.2.1 GENERAL The RTU-292 Radio/Telephone Interface Unit will provide a trouble-free automatic connection between a radio system and telephone or other two-wire line. The unit is suited for use with HF, VHF, UHF or satellite systems and is applicable to full or half-duplex modes.
RTU-292 Operations Manual automatic. The unit will continuously adapt to changing line conditions, making operation insensitive to line impedance changes. In the Automated Operations mode, the RTU-292 combines the unique features of its adaptive DSP hybrid with fully unmanned auto-dial/auto-answer capability. In its standard configuration, the unit uses tone prompts to signal the remote user of the operations that must be performed to control the unmanned radio station.
RTU-292 Operations Manual 1.3.1.2 Handset/Speaker Interface The Handset/Speaker Interface Section contains the speaker pre-amp and driver, the headphone pre-amp and driver. Audio gates controlled by the front panel switches route the audio to the speaker and handset microphone preamplifier and ALC (Automatic Level Control) circuit. 1.3.1.3 Radio Interface The Radio Interface Section consists of operational amplifier circuits that handle the audio interfaces between the RTU-292 and the radio.
RTU-292 Operations Manual Table 1-1 Qty 1 1 1 Equipment and Accessories Supplied Part Number 5970-600000 5970-600200 5970-600150 Item RTU-292 Standard Operation & Maintenance Manual Accessory Kit Part Number 0150-200000 0313-037770 0313-060000 0360-009000 0650-005100 0650-010100 0827-000001 0827-102401 Item Handset, PTT, black Cable, misc.
RTU-292 Operations Manual 1.3.4 OPTIONS RTU-292 options include the: The Voice Prompt Option, which gives verbal prompts to the user as an aid in all aspects of unit operation; The Local Phone Option, which allows a DTMF telephone set to be plugged into the unit, allowing control and access from the phone set; and the VMM-100 module, used to add VMR (Voice Modulation Recognition) and DSP noise reduction capability.
RTU-292 Operations Manual Table 1-3 RTU-292 SPECIFICATIONS TELEPHONE LINE INTERFACE (J2, Male DB-9 Connector) Output & Input Levels to Phone Line Nominally -12 dBm. (Adjustable -21 to 0 dBm in 3 dB steps). Frequency Response +2 dB, 300 to 3200 Hz. Output Impedance to Phone Line 600 Ohm . VOX Sensitivity 16 +2 dB Below Phone Line Input Level Setting. (-25 dBm @ -9 dBm Level Setting, for example) VOX Hang Time 0.6 Second or 2.0 Seconds, (Internally Settable).
RTU-292 Operations Manual 2 Installation 2.1 GENERAL This section provides the instructions for unpacking, inspection, installation and set-up. Also included are directions for reshipment of damaged parts or equipment. 2.2 UNPACKING AND INSPECTION After unpacking the unit, retain the carton and packing materials until the contents have been inspected and checked against the packing list. If there is a shortage or any evidence of damage, do not attempt to use the equipment.
RTU-292 Operations Manual Mark all sides of the package: FRAGILE - ELECTRONIC EQUIPMENT Inspect the package prior to shipment to be sure it is properly marked and securely wrapped. 2.4 INSTALLATION OVERVIEW Follow these four steps to properly install the RTU-292: 1. Provide mechanical mounting for the unit. (Rack slides or shelves are required for 19" rack mounting) 2. Provide the proper primary power for the unit. 3. Interconnect the unit with the radio and system as appropriate. 4. Check Section 2.
RTU-292 Operations Manual Table 2-1 RTU-292 Factory Default Settings This table describes the settings of all RTU-292 internal adjustments and switch positions as set when the unit is shipped.
RTU-292 Operations Manual 2.6 POWER REQUIREMENTS The RTU-292 is designed to operate from 115V or 230V, 47 to 63 Hz, single phase AC power source. The unit will meet all of its specifications over a voltage range of +15% from nominal. Power consumption is 20 VA typical, 50 VA maximum. Alternatively, the unit may be operated from a (nominal) +12, +24, or +28 VDC supply. At the +12VDC setting, the unit will operate from +11 to +15VDC, and at the +24/+28 VDC setting, the unit will operate from +22 to +30 VDC.
RTU-292 Operations Manual and +28 VDC (nominal) supplies. The unit will automatically switch over to the use of the DC input when the AC source drops too low or is not available. Slide switch S6 on the Main Board is used to select either +12 or +24/+28 VDC operation. S1 is located near the left front edge of the Main Board; the +12V and +24/+28V switch positions are clearly marked on the board. The RTU-292 is set in the factory to the +24/+28 VDC position. 2.
RTU-292 Operations Manual Table 2-2 Recommended Phone Line Settings Type of System Send & Receive Levels Dial-Up lines in a U.S. Domestic phone system Dial-Up lines in most non-U.S. telephone systems PBX Systems Field Wire not connected to a telephone network -9 dBm -9 dBm -12 dBm -6 dBm When using the RTU-292 in a domestic U.S. dial-up telephone network, the MAXIMUM level allowed into a telephone line at the subscriber end is -9 dBm.
RTU-292 Operations Manual 2.8.3 VOX HANGTIME The RTU-292 VOX circuitry holds the radio in the keyed state for a short time after the telephone audio signal is no longer detected. This delay, called hangtime, ensures that the VOX is not de-activated between syllables or during short pauses in speech. The standard VOX hangtime duration is 2.0 seconds. Dipswitch SW2-6 allows the setting of 0.6 seconds hangtime if required. The factory default setting, SW2-6 On, sets the VOX hangtime to the longer 2.
RTU-292 Operations Manual 2.8.6 RX LINE INPUT IMPEDANCE The factory setting for the Receive Line input impedance is 600 Ohms, but if a high input impedance for bridging is needed, the impedance may be set to approximately 47k Ohm. To set to high impedance, move the jumper plug at JP2 from pins 1&2 (low, 600 ohms) to pins 2&3 (high, 47k ohms). 2.8.7 DIAL MODE The dialing mode of the RTU-292’s internal telephone is set by internal dipswitch SW1-4. The dial mode choices are DTMF and 10pps Pulse.
RTU-292 Operations Manual Full/Half Duplex Table 2-7 SW2-8 Full/Half Duplex Off On Full Duplex Half Duplex * 2.8.10 SERIAL PORT BAUD RATE Internal dipswitches SW1-1 and SW1-2 on the Main board configure the RS-232 baud rate of the unit's serial port as shown in the table below. The factory setting is 9600 Baud. Baud Rate Table 2-8 SW1-1 SW1-2 Baud Rate Off On Off On Off Off On On 300 1200 4800 9600 * 2.8.
RTU-292 Operations Manual 2.8.12 PASSWORD PROTECTION Dipswitch SW1-5 enables or disables the RTU-292's password protection feature. Password protection prevents unauthorized access to the system from the PSTN line when the RTU-292 is in the Automated Operation Mode. (See section 3.7 for a full explanation of Automated Mode Operation and the use of the Password Protection Feature). The factory setting is disabled, SW1-5 Off. To enable the password protection feature, turn SW1-5 On.
RTU-292 Operations Manual Table 2-12 Local Phone Enable SW1-7 Local Phone Off On Disabled Enabled Table 2-13 Local Phone Ringthrough SW1-8 Ringthrough Off On Disabled * Enabled 2.8.15 TRANSMIT LEVEL SET-UP MODE Dipswitch SW2-7 is used by the factory to enable a special set-up mode. See section 2.10 for instructions. This switch must remain Off (Normal Mode) for standard operation. Table 2-14 TX Level Set-up Mode SW2-7 Set-up Mode Off On Disabled * Enabled 2.8.
RTU-292 Operations Manual 2.9.1 TELEPHONE CONNECTION Connect the telephone line to the PHONE J1 RJ11C standard modular connector. The unit will work with either an AC or DC telephone line. Telephone line polarity is not important. Note that the phone connections are repeated at the terminal block on the rear panel for convenience. Only one phone line may be connected; do not use J1 and the telephone connections on the terminal block simultaneously.
RTU-292 Operations Manual Table 2-16 Pin 1 2 3 4 5 6 7 8 9 P1-RADIO (DB-9 Male) Function Balanced Receive Audio Input B Chassis Ground Transmit Audio Output A External Signal Input /Key Output A (Relay Closure to Ground) Receive Audio Input A Transmit Audio Output B /Remote Key Input /Key Output B (Relay Closure to Ground) 2.9.3 HANDSET CONNECTOR The handset supplied with the RTU-292 is plugged into front panel jack J7.
RTU-292 Operations Manual 2.9.4 TERMINAL BLOCK The terminal block on the rear panel is supplied for convenience when interfacing the RTU-292 to a communications system. The terminal block connections are in parallel with the I/O terminals of the same name found on different connectors. If the telephone line connections at Pin 1 and 2 of the terminal block are used to connect to PSTN line, then the TEL LINE connector, J1, should not be used.
RTU-292 Operations Manual 2.9.5 RS-232 CONNECTION Use P2 on the rear panel to connect to the RTU-292 RS-232 interface. RS-232 control is fully explained in section 5. Table 2-19 Pin 1 2 3 4 5 6 7 8 9 P2 – RS-232 Connector (DB-9 Male) Function No Connection RS-232 RX Input RS-232 TX Output Reserved- Do not connect Ground Reserved- Do not connect No Connection No Connection No Connection 2.
RTU-292 Operations Manual 2.10.1.2 Adjust TX Level Adjust so that the transmitter is just fully modulated. If the transmitter is AM or SSB, use its output power meter (if available) to determine the amount of modulation. Do this by advancing R133 clockwise just until the power meter stops rising. This will produce maximum modulation without activating the radio’s compressor. When using an FM transmitter, a deviation meter may be necessary to determine the amount of modulation.
RTU-292 Operations Manual occasionally on voice peaks. Note that the PEAK indicator responds only to incoming radio audio, not telephone audio. The range of the RX Level Adjust control is about -40 dBm to +10 dBm. If the level from the radio is outside this range, the correct level cannot be set using the RX Level Adjust control alone, and it will be necessary to adjust the audio output at the radio itself until the correct level is obtained.
RTU-292 Operations Manual Figure 2-1 JPS Communications, Inc.
RTU-292 Operations Manual Figure 2-2 Control and Connector Locations 2-19 JPS Communications, Inc.
RTU-292 Operations Manual Figure 2-3 JPS Communications, Inc.
RTU-292 Operations Manual Figure 2-4 Internal Option Setting Details 2-21 JPS Communications, Inc.
RTU-292 Operations Manual Figure 2-5 JPS Communications, Inc.
RTU-292 Operations Manual Figure 2-6 Interface Details 2-23 JPS Communications, Inc.
RTU-292 Operations Manual 2.11 INSTALLATION CHECKLIST Installation Checklist Table 2-20 Provide suitable Mounting and Cooling. See Section 2.5. Check AC Line voltage selection. See Section 2.7. DC Operation needed? See Section 2.7. Make Interconnections. See Section 2.9 for External Interconnect Information. Serial Remote Control needed? Set Serial Remote Baud Rate with SW1-1 and 2. See RS232 protocol in Section 5. Set TX/RX Audio Levels if necessary. See Table 2-1 and Section 2.10.
RTU-292 Operations Manual 3 Operation 3.1 GENERAL This section contains information and instructions required for proper operation of the RTU292. 3.2 FRONT PANEL CONTROLS, INDICATORS AND CONNECTORS 3.2.1 MAIN POWER SWITCH The Main Power switch controls the external DC power to the unit. The switch is a locking toggle type to prevent inadvertent operation. 3.2.2 HEADPHONE JACK This front panel jack accepts a standard 1/4 inch diameter monaural phone plug.
RTU-292 Operations Manual 3.2.6 KEYPAD The 12-key keypad is used for telephone dialing. It is active only when the TEL LINE/PHONE path is selected. Dialing may be either via DTMF mode or pulse mode as determined by internal dipswitch selection. 3.2.7 SPEAKER VOLUME CONTROL This potentiometer controls the volume of audio (except telephone ringer volume) at the front panel speaker. Rotate clockwise to raise audio from minimum to full.
RTU-292 Operations Manual 3.2.11 SPEAKER BUTTONS These two buttons, SPEAKER/PHONE and SPEAKER/RADIO, determine whether the speaker monitors telephone receive audio, radio receive audio, or both. Note that if a radio-totelephone call is underway and both buttons are pressed, the full conversation is being monitored. There is an LED alongside each button that is illuminated when the associated path is selected. 3.2.
RTU-292 Operations Manual 3.3 REAR PANEL CONNECTORS Accessible at the RTU-292 rear panel are the radio connector, telephone line and local phone connector, the signal terminal block, the DC power terminal block, an RS-232 connector, and the AC power connector/voltage selector/fuse holder assembly. See section 2.9 for full pin-out information. 3.3.1 P1 RADIO CONNECTOR This male DB9 connector is the interface between a radio system and the RTU-292. It contains transmit audio, receive audio, and keylines. 3.
RTU-292 Operations Manual 3.4 OPERATION 3.4.1 OPERATION OVERVIEW The RTU-292 is a flexible piece of equipment that contains a telephone and a radio/telephone interface circuit with a unique adaptive hybrid. These circuits are arranged so that they can be used together or independently in several different ways. The unit may be used to manually create the telephone to radio connection, or an unmanned connection can be made in the automated mode. Here are some examples of RTU-292 operating modes: 1.
RTU-292 Operations Manual 3.4.4 RECEIVING A TELEPHONE CALL NOTE The handset-to-telephone path may be left in the enabled condition (HANDSET/PHONE LED ON) even when the unit is not connected to the telephone line. Only one button (TEL LINE/PHONE) must then be pushed to answer the telephone. The following scenario assumes that the HANDSET/PHONE LED is already ON. 1.
RTU-292 Operations Manual noise source is switched off, the LED is lit continuously, and the unit is ready for operation. This adaptation procedure normally takes less than one second. For adaptation to be successful, the far end of the phone line must be quiet (there must be no signal coming into the RTU-292 from the phone line during adaptation). If there is incoming audio, the unit may not be able to adapt, but will keep trying for up to ten seconds.
RTU-292 Operations Manual 3.4.8.3 Once the telephone and radio party have both been contacted, the operator should advise the telephone party that a phone patch is being set up. He may want to advise that a short noise burst (not extremely loud) will be heard in the telephone receiver, and that the conversation can proceed following the burst. The operator then pushes the TEL LINE/RADIO button to begin adaptation, indicated by a flashing TEL LINE/RADIO LED. 3.4.8.
RTU-292 Operations Manual 3.4.10 TRANSMITTER KEYING, FULL DUPLEX SYSTEM In a full duplex system, the transmitter can be held continuously keyed during a conversation, because the system can receive and transmit at the same time. Thus, VOX is not required. In this case, the transmitter may be keyed from the RTU-292 by pulling either of its external KEY inputs low. The Full/Half Duplex dipswitch setting has no effect on transmitter keying. 3.
RTU-292 Operations Manual 3.7.1.3 Waiting For Input (QUERY) When the RTU-292 needs user input it will play 1 short low-pitched tone followed by 1 short high pitched tone. A QUERY is played whenever the user needs to enter some data such as a password or telephone number. 3.7.1.4 Radio Is Keyed (KEYED) When the RTU-292 wants to signal that the user has keyed the radio it will play 1 short highpitched tone.
RTU-292 Operations Manual The following paragraphs describe the sequence of operations used to automatically place a call through the RTU-292 to a radio via the outside phone line. This description assumes that the RTU-292 has a Voice Prompt Option installed. Units without a Voice Prompt Option will function identically except for a lack of voice prompt messages. The tone prompts listed in 3.7.1 are provided by the RTU-292 whether or not the Voice Prompt Option is installed. 3.7.3.
RTU-292 Operations Manual 3.7.3.4 The RTU-292 Enters the COMMAND Mode After the RTU-292 completes the adaptation sequence, it enters the Command Mode and waits for the caller to respond with commands. In Command Mode the user may enter DTMF commands by pressing a number on the telephone’s keypad. The unit stays in Command Mode until the caller gives the * # sequence to hang up. If the caller gives an incorrect command the unit plays the ERROR tone and gives the “Invalid Entry” voice prompt.
RTU-292 Operations Manual the unit signals that it is dropping the link due to a lack of activity, either party may prevent the disconnection by speaking within five seconds. 3. Pressing the OFF button on the front panel of the RTU-292 will also cause the system to disconnect. 4. When the local phone is used, its operator may use the * # sequence or may simply hang up the phone. 3.7.6 DTMF CONTROL COMMANDS Tables 3-1, 3-2, and 3-3 explain and list the RTU-292’s various DTMF command modes.
RTU-292 Operations Manual Table 3-1 Standard DTMF Operational Commands These commands may be entered by the RTU-292 front panel keypad, or by the keypad of a connected telephone or by a telephone set wired to the Local Phone Option. See 3.7.6 for special instructions regarding the use of the front panel keypad to send DTMF Commands. DTMF Command *# *0 *1 *2 *3 *4 *5 *6 *7 *8 * 99 Function Terminate the call. Manual Keying Toggle. Press once to key; the next press will unkey, etc.
RTU-292 Operations Manual Table 3-2 Programming Mode DTMF Commands These commands may be entered by the RTU-292 front panel keypad*, or by the keypad of a connected telephone or by a telephone set wired to the Local Phone Option. The unit must be put into the programming mode by entering *99 before these commands can be executed. *See 3.7.6 for special instructions regarding the use of the RTU-292 keypad. DTMF Command *0x *1xxx# *2x * 3x * 4xx *5 *6x *7&*8 *9 *# Function Call Logging Enable/Disable.
RTU-292 Operations Manual 3.7.7 RTU-292 PASSWORD PROTECTION The password protection feature is enabled by a dipswitch setting (SW1-5, see Table 2-1). When passwords are enabled, access to the system is denied unless a user enters the correct password. The same password applies both to access via telephone and via a radio (if the DTMF Radio Access feature is used).
RTU-292 Operations Manual 3.7.10 USING THE RTU-292 SPEED DIAL FEATURE The RTU-292 has the ability of storing 99 telephone numbers in non-volatile memory. These numbers may be used when making a call using via UHF/VHF radio with a DTMF keypad. To use the speed dial feature, simply enter the speed dial number instead of a telephone number. Note: The Voice Prompt Option is recommended if the speed dial feature is used, but is not required.
RTU-292 Operations Manual 3.7.11 OPTIONAL 4 WIRE OPERATION The unit can be set to operate with a four wire device instead of a standard 2 wire phone. The additional I/O is handled by header J6 on the main PCB. The STU-III option makes use of this capability. To put the RTU-292, first place the unit in programming mode with the *99 command. Then enter the * 6 1 DTMF command. To return to 2 wire operation, enter * 6 0.
RTU-292 Operations Manual 4 RTU-292 Theory Of Operation 4.1 GENERAL This section gives enough detail of the theory of operation of the RTU-292 audio and power supply sections to allow them to be troubleshot in the field. The same level of detail is not supplied for the DSP module and the CPU portion as they are considered impractical to field troubleshoot because of the specialized knowledge and test equipment required. If a fault is suspected in these sections, factory repair is required. 4.
RTU-292 Operations Manual 4.3.2 TELEPHONE INTERFACE CIRCUITS 4.3.2.1 Telephone Send Circuits Amplifier U1B generates the Telephone Send signal (the audio which is sent down the phone line from the RTU-292). U1B is configured as an inverting stage with its gain set by a combination of input and feedback resistors selected by analog gates U4A through U4D. The send level calibration assumes that there is a 0 dBm signal level at the input to U1B on U8B15.
RTU-292 Operations Manual the signal at A/D 2 from that at A/D 1 and the difference appears on D/A 1, which is named TEL after passing through gate U8C. 4.3.2.3 Ring Detector and Tone Ringer Integrated circuit U7 is an optocoupler that senses the ring voltage on the telephone line. When a ring voltage is detected, U7-5 goes low with the frequency and cadence of the ring voltage.
RTU-292 Operations Manual 4.3.3.4 DTMF Detector Circuit U25 is a DTMF detector/decoder dedicated to listening for DTMF signals from the radio. Its input is connected to the leveled radio receive signal at U20B-7. The DTMF data is read by the processor. A separate DTMF detector running in DSP software listens for DTMF from the telephone line. 4.3.3.5 FSK Modem Circuit U26 is a hardware FSK modem that listens for FSK signals from the radio at U20B-7, and can send FSK signals to the radio from U26-17. 4.3.
RTU-292 Operations Manual 4.3.6.1 Adaptive Hybrid The adaptive hybrid is the central function of the RTU-292. Its purpose is to separate and isolate the telephone receive signal by subtracting the telephone send signal from the mixed telephone send and receive signals. If this subtraction is done perfectly, the telephone receive signal is completely isolated.
RTU-292 Operations Manual 4.3.7 POWER SUPPLY The power supply is detailed in page 8 of 9, Figure 8-2. It supplies regulated DC voltages of +5V, +12V, -5V, and -12V from both AC and DC inputs. 4.3.7.1 AC Power Supply The AC power supply is a conventional passive regulator supply with a small PC mounted line transformer, T4 which has dual primaries for 115 or 230 VAC operation, and has dual 15 VAC secondaries which are wired in parallel.
RTU-292 Operations Manual Bus drivers U60 and U61 are the input devices for the front panel switches; latches U62 and U63 light the front panel LEDs. Latches U50 through U53 send control signals mainly to the audio circuit sections. U56 and U57 send inputs to the data bus; U54 and U55 read Option switches SW1 and SW2. Keypad decoder chip U59 provides the keyboard interrupt and translates keypad closures before sending them onto the data bus via latch U58. 4.3.
RTU-292 Operations Manual 4.5.3 VOICE PROMPT SOFTWARE The voice prompt board software receives the prompt number command through J1 and translates it into the prompt address in EPROM U5. 4.6 LOCAL PHONE OPTION The Local Phone Option allows a standard telephone set to be plugged into an RJ-11C modular jack at the rear of the RTU-292. This telephone set may then be used to place or receive calls via the RTU-292 to the PSTN or an associated radio.
RTU-292 Operations Manual 5 Remote Control Protocol 5.1 GENERAL Included in this section are instructions for controlling the RTU-292 via its RS-232 serial communications port. The protocol listed in this section is the standard command set that accompanies the standard software version. If an RTU-292 is shipped with custom software that employs different commands, a set of special version notes, including a modified protocol, will be shipped with the unit. 5.
RTU-292 Operations Manual When a command is sent to the RTU-292 it is buffered up and acted on as soon as possible. Once the command has been executed, the RTU-292 will return a "Status" response. The format of this status response is explained in greater detail in the section 5.4, "Status Returned From The RTU-292". The RTU-292 is designed to act on one command at a time. The user must wait for a response from a given command before entering the next command.
RTU-292 Operations Manual 5.3.1 NULL Command This command may be used as a quick way to insure that RS-232 communication with the RTU-292 is functioning. The command has no parameters. Expected Response: NULL Response. Example: % E0 5.3.2 ; Command sent to the RTU-292. ; Status returned from the RTU-292. Auto Answer Command AUTO_ANS This command is to enable, disable or query the current status of Auto Answer. Expected Response: Auto Answer Response.
RTU-292 Operations Manual 5.3.4 Date Command DATE This command is used to check or set the date on the RTU-292 internal clock. If no parameters are given the command simply returns the time/date. The parameter format is day (01-31), month (01-12), year (00-99). Note: the Call Logging Feature must be enabled before use. See 3.7.12. Expected Response: Time/Date Response. Examples: DATE ; Command requesting the current time and date from the RTU-292.
RTU-292 Operations Manual 5.3.6 Disconnect Command DISC This command is used to drop the PSTN connections. Expected Response: Disconnect Response. Examples: DISC ; Command requesting that the PSTN be disconnected. %DISC E0 ; Status returned indicating that the PSTN was disconnected. 5.3.7 DTMF Command DTMF This command is used to generate DTMF tones via the PSTN line. This is useful when the call involves the use of a calling card or automated phone system.
RTU-292 Operations Manual 5.3.8 Handset Phone Command HS_PH This command is to enable, disable or query the current status of Handset Phone Expected Response: Handset Phone Response. Examples: HS_PH ON ; Command to enable the Handset Phone path. %HS_PH ON E0 ; Status returned showing that the Handset Phone path is enabled. HS_PH ? ; Command requesting the status of the Handset Phone path. %HS_PH OFF E0 ; Status returned showing that Handset Phone is disabled. 5.3.
RTU-292 Operations Manual 5.3.10 Speaker Phone Command SPKR_PH This command is to enable, disable or query the current status of the Speaker Phone path. Expected Response: Speaker Phone Response. Examples: SPKR_PH ON ; Command to enable the Speaker Phone path. %SPKR_PH ON E0 ; Status returned showing that the Speaker Phone path is enabled. SPKR_PH ? ; Command requesting the status of the Speaker Phone path.
RTU-292 Operations Manual 5.3.12 Speed Dial Command SD This command is used to program or review data in speed dial memory. There are 99 locations in speed dial memory. These range from 1 to 99, with location 0 being used by the system as “scratch pad” memory. The keyword “ALL” may be used in place of the speed dial location to refer to all of speed dial memory. The second argument allows the speed dial location to be programmed to the given number string.
RTU-292 Operations Manual 5.3.13 Tel-Line Phone Command TEL_LINE_PH This command is to enable, disable or query the current status of Tel-Line Phone. Note that enabling Tel-Line Phone will put the PSTN in an Off-Hook status. Disabling Tel-Line Phone will only put the PSTN back on hook if Tel-Line Radio is also disabled. To quickly disconnect the PSTN use the DISC command. Expected Response: Tel-Line Phone Response. Examples: TEL_LINE_PH ON ; Command to enable the Tel-Line Phone path.
RTU-292 Operations Manual 5.3.15 Time Command TIME This command is used to check or set the time on the RTU-292 internal clock. If no parameters are given the command simply returns the time/date. The parameter format is hour (00-23), minutes (0059), seconds (00-59). The time is set and displayed in 24-hour format. Note: the Call Logging Feature must be enabled before use. See 3.7.12. . Expected Response: Time/Date Response.
RTU-292 Operations Manual 5.4 STATUS RETURNED FROM THE RTU-292 The following section describes the various responses the user may expect from the RTU-292. The format of a response string is: %response ... Exx There are 3 types of responses: • Synchronous, the response is given as a result of receiving a specific command. • Asynchronous, the response is given because of some change in operating status in the RTU-292 that was not directly due to a command being issued.
RTU-292 Operations Manual 5.4.1 NULL Response % Exx Type: Synchronous. Response To: NULL Command. This response is given after receiving a NULL command. No data is returned in the response. Example: ; Command sent to the RTU-292. % E0 ; Status returned from the RTU-292. 5.4.2 Auto Answer Response %AUTO_ANS Exx Type: Synchronous. Response To: Auto Answer Command. This response indicates the auto answering status.
RTU-292 Operations Manual 5.4.4 Dial Response %DIAL Exx Type: Synchronous. Response To: Dial Command. This response indicates that the given number was dialed. Valid digits for the number string are '0'-'9', the characters * # and ','. The comma character is used to produce a 2 second pause while dialing. No spaces are allowed in the number string. Examples: %DIAL 5551234 E0 ; Status returned indicating that the number 5551234 was dialed.
RTU-292 Operations Manual 5.4.7 Elapsed Time Response %Connection dropped, elapsed time: hh:mm:ss Exx Type: Asynchronous. Response To: Completion of a Radio/Telephone call. This response indicates that a Radio/Telephone call has been terminated. The response shows the elapsed time of the call. The time is shown in 24-hour format. Note: the Call Logging Feature must be enabled before use. See 3.7.12.
RTU-292 Operations Manual 5.4.10 Speaker Phone Response %SPKR_PH Exx Type: Synchronous. Response To: Speaker Phone Command. This response indicates the Speaker Phone path status. Examples: %SPKR_PH ON E0 ; Status indicating that the Speaker Phone path is enabled. %SPKR_PH OFF E0 ; Status returned indicating that the Speaker Phone path is disabled. 5.4.11 Speaker Radio Response %SPKR_RAD Exx Type: Synchronous. Response To: Speaker Radio Command.
RTU-292 Operations Manual 5.4.12 Speed Dial Response %SD Exx Type: Synchronous. Response To: Speed Dial Command. This response shows the contents of a given speed dial memory location. Examples: %SD 5 5551212 E0 ; Status indicating that speed dial location 5 contains the number 5551212. %SD 21 is empty. E0 ; Status indicating that speed dial location 21 is empty. 5.4.13 Tel-Line Phone Response %TEL_LINE_PH Exx Type: Synchronous.
RTU-292 Operations Manual 5.4.15 Time/Date Response %dd-MON-yy hh:mm:ss Type: Synchronous. Response To: TIME or DATE Command. This response indicates the current Time and Date for the RTU-292 internal clock. Note: the Call Logging Feature must be enabled before use. See 3.7.12. Examples: %01-MAR-98 11:05:20 ; Status returned indicating that the date is March 1st ‘98, and the time is ;11:05 and 20 seconds in the morning.
RTU-292 Operations Manual 5.5 CALL PROGRESS RESPONSES FROM THE RTU-292 The following section describes the responses the user may expect from the RTU-292 when Call Progress is active. Call progress is active whenever the PSTN is “off-hook”. Table 5-3 %CP_RING Exx %CP_BUSY Exx %CP_NO_ANS Exx %CP_NO_DIALTONE Exx %CP_AUTO_ANSWERED Exx . Call Progress Responses Call Progress detects Ringback. Call Progress detects a Busy signal. No answer after the DIAL command originated a call.
RTU-292 Operations Manual 6 Maintenance and Repair 6.1 GENERAL Included in this section are the Test Procedures and performance evaluation criteria for the supplied equipment. Also provided is a Fault Analysis Table (Table 6.1) to aid in isolating a fault. Table 6.2 identifies replaceable parts. 6.2 PREVENTIVE MAINTENANCE There are no preventive or periodic maintenance requirements for this equipment. 6.
RTU-292 Operations Manual 6.5.2 HYBRID BALANCE MEASUREMENT The test procedure outlined below allows measurement of the hybrid balance, or trans-hybrid loss, attainable with the RTU-292. This characteristic determines how much radio receiver input signal will leak into the transmitter output of the RTU-292. In the test set-up, the noise generator simulates the radio receiver, the audio voltmeter simulates the transmitter and the resistor simulates the telephone line.
RTU-292 Operations Manual Figure 6-1 Hybrid Balance Test Set-Up 6.5.2.1 Main Hybrid Test Procedure 1. Disconnect the RTU-292 from all other equipment and connect the test equipment as shown in Figure 6.1. 2. Set the PSTN levels for -9 dBm using Option SW2-1, -2, and -3. 3. Start with the following pushbuttons OFF: TEL LINE/PHONE, TEL LINE/RADIO, and TEL VOX. The positions of the other buttons are unimportant. Place the RTU-292 in set-up mode by setting SW2-7 ON and then turning on the power.
RTU-292 Operations Manual 6.5.2.2 Alternate Hybrid Test Procedure This alternate test procedure uses a more easily obtainable audio signal generator in place of the noise generator. While this procedure cannot give a complete picture of the unit’s performance in actual use, it will allow a determination of whether or not the RTU-292 is operating properly. 1. Disconnect the RTU-292 from all other equipment and connect the test equipment as shown in Figure 6.
RTU-292 Operations Manual 6.5.3 VOX SENSITIVITY MEASUREMENT The following test procedure measure the sensitivity of the VOX in the RTU-292. This is the amplitude of the incoming signal from the telephone line required to trigger the VOX. Figure 6-2 VOX Sensitivity Test Set-Up 6.5.3.1 VOX Test Procedure 1. Disconnect the RTU-292 from all other equipment and connect the test equipment as shown on Figure 6.2. 2. The PSTN level setting must be known.
RTU-292 Operations Manual Table 6-1 Fault Analysis No LEDs light after power-up Check for correct setting of DC voltage switch S6. Check for proper polarity of DC input. (If polarity is reversed, the unit will not be damaged, but will not operate. At power-up, the PEAK LED flashes at a steady rate and the unit does not function properly. The RTU-292 has failed its self-test function. Check for proper seating of the internal DSP module. Contact JPS Customer Service.
RTU-292 Operations Manual Table 6-2 Replaceable Parts List 5970501000 Chassis Assembly Part No. Description Reference Designator Speaker, 8 ohm, 3" sq Conn, MTA-156, 3-pin, receptacle Conn, circular, pnl mt receptacle Conn, cable, 7-pin, AMP Conn, cable, 8-pin. AMP Conn, barrier strip, 2 position AC Filter and Fuseholder Assy Handle, .25 x 1.25 x 2.75 mtg ctr Knob, blk w/dot, .
RTU-292 Operations Manual 5970506100 Part No.
RTU-292 Operations Manual 5970506100 RTU-292 Main PCB Assembly (continued) Part No.
RTU-292 Operations Manual 5970506100 RTU-292 Main PCB Assembly (continued) Part No. Description 1820912000 1821102000 1826020000 1827400050 1828759030 1829101040 1920280000 1920520000 1941008000 1944020001 2020016001 2021334000 2040080200 2043041240 2047070000 Reference Designator Resistor, carb, 1/4w, 9100 ohm Resistor, carb, 1/2w, 1000 ohm Resistor, Varistor, RMS200V Resistor, ww, 5W, 40 ohm Resistor, pwr ox, 3W, 7.
RTU-292 Operations Manual 7 RTU-292 Options 7.1 GENERAL Included in this section are installation instructions for field installable RTU-292 options and set-up instructions for all options that have configuration dipswitches, jumpers, potentiometers, etc. Operational instructions are provided for all options other than the Voice Prompt Option; this frequently used options is explained along with standard unit operation in section 3.
RTU-292 Operations Manual 7.2 VOICE PROMPT OPTION When the Voice Prompt Option is installed, the RTU-292 will send helpful prompts to system users to guide them in proper system operation and inform them of the current system status. The standard language is female English, though other languages and genders may be purchased, an additional fee to create the non-standard prompts is charged. Contact JPS for details. 7.2.
RTU-292 Operations Manual Figure 7-1 Voice Prompt Option Installation 7-3 JPS Communications, Inc.
RTU-292 Operations Manual 7.3 LOCAL PHONE OPTION The RTU-292 has an extra rear panel modular phone jack that allows a standard DTMF telephone set to be plugged directly into the unit when the Local Phone Option is installed. This Local Phone set can make and receive calls via the outside line, communicate with an operator at the RTU-292, or send and receive audio through the companion radio. It can also be used to program the RTU-292.
RTU-292 Operations Manual 7.3.2 LOCAL PHONE OPTION OPERATION When the handset of the local phone is picked up, a special dial tone, generated by the RTU292, will be heard in its receiver.
RTU-292 Operations Manual 7.4 VMM-100 OPTION The VMM-100 VMR Module implements Voice Modulation Recognition (VMR) which enables the receive audio path when speech is present and disables it when speech is not present. This module also implements a form of noise reduction known as "dynamic peaking" which reduces background white noise. These features are implemented with a DSP circuit on the VMM board. 7.4.
RTU-292 Operations Manual 7.4.2 VMM-100 Software The VMM-100 DSP software can provide voice modulation recognition, noise reduction, or both. The module's operating mode is set by logic inputs at P9 pins 3 and 4 7.4.2.1 VMR Algorithm The VMR algorithm works by passing the audio through a series of bandpass filters that are spaced throughout the speech frequency spectrum. The outputs of these filters are then examined for signals with speech characteristics.
RTU-292 Operations Manual The dipswitches on the VMM-100 module may be changed at any time during operation; the DSP is constantly checking the states of these switches. The VMR and Noise Reduction modes can be used individually or simultaneously. They are toggled off & on via standard DTMF Operational Commands. See section 3.7 and Table 3-1. Figure 7-3 JPS Communications, Inc.
RTU-292 Operations Manual Table 7-6 GENERAL Frequency Response Input Level Input Impedance DSP Output Delay Noise Reduction Type Noise Reduction Audio Output Audio Output Distortion VMR Performance VMR Output Delay VMR Hang Time Indicators Size Power Requirements ENVIRONMENTAL Operating Temperature Storage Temperature Humidity Shock Vibration Altitude VMM-100 SPECIFICATIONS 100 to 3400 Hz +/- 2dB 0 dBm nominal Unbalanced 10k Ohm < 10mS Dynamic Peaking around coherent signals Approximately 10-20 dB 10 Ohm
RTU-292 Operations Manual Table 7-7 Pin 1 2 3 4 5 6 7 8 9 10 VMM-100 I/O CONNECTOR INFORMATION (P9) Signal Audio Input (see specs above) Audio Output (see specs above) NR1; Logic Input; Low selects DSP Noise Reduction NR2; Logic Input; Low selects DSP Voice Modulation Recognition -5V; Supply Input (see specs above) +5V; Supply Input (see specs above) +12V; Supply Input (see specs above) NR3; Logic Output; Follows state of SW1-1; Low indicates default is NR on NR4; Logic Output; Follows state of SW1-2; Lo
RTU-292 Operations Manual 7.5 DTMF ACCESS OPTION This option allows a radio user to use his DTMF keypad to quickly place a telephone call via the RTU-292. If the user does not have DTMF capability, the Squelch Break Access Option allows the use a series of squelch breaks to automatically connect to the telephone at speed dial location #01 (see next section). In the following description, system voice prompts are listed. If the Voice Prompt Option is not installed, only the tone prompts will be heard.
RTU-292 Operations Manual If the number is busy, the busy tones will be broadcast for approximately 5 seconds before the RTU-292 terminates the call attempt. Once the RTU-292 detects ringback, the RTU-292 begins a 30 second timer and waits for the call to be answered. If this does not happen before the timer expires, the call attempt is terminated. 7.5.6 After the Call Begins The RTU-292 now enters its "Command Mode", meaning that the phone user may enter any of the available DTMF commands from Table 3-1.
RTU-292 Operations Manual 7.6 SQUELCH BREAK ACCESS OPTION This option allows a radio user who does not have DTMF capability to quickly place a telephone call via the RTU-292. The radio user simply transmits a series of squelch breaks and is then automatically connected to the telephone at the RTU-292 speed dial location #01.
RTU-292 Operations Manual as a warning. The radio caller or the phone user may initiate activity within 5 seconds of the warning beeps to reset the timer. If neither user does so, the unit will then terminate the call. To terminate the call at any time, the radio user may enter * # or give three squelch breaks within four seconds. The phone user may enter * # to hang up. 7.
RTU-292 Operations Manual 7.8 RADIO CONTROL OPTION When this software option is enabled, the RTU-292 may be used to control a Motorola URC200 radio connected to the unit via the RS-232 serial port. The control commands may be entered by the RTU-292 front panel keypad, or by the keypad of a connected telephone or by a telephone set wired to the Local Phone Option. To use front panel keypad control, the LINEPHONE and LINE-RADIO pushbuttons must both be off. See 7.7.
RTU-292 Operations Manual While for: • • • • the operator is using the keypad to control the RTU-292, the unit will not be available PSTN Auto Answering. Radio Squelch Break Access Operation. Radio DTMF Access Operation. Local Phone Control. Table 7-9 DTMF Radio Control Commands These commands are intended to control a Motorola URC-200 radio associated with the RTU-292. The Radio Control Option must be enabled (See Table 1-2). Command Followed By Command Description *0 [0..
RTU-292 Operations Manual 8 SCHEMATIC DIAGRAMS 8.1 GENERAL This section has all RTU-292 schematic diagrams. They include: Figure 8-1 Front Panel Schematic A single sheet showing the switch boards and other front panel components. Figure 8-2 Main Board Schematic This nine page schematic details all components on the main board.
RTU-292 Operations Manual Blank Page JPS Communications, Inc.
RTU-292 Operations Manual 9 Index * C * #....................................................................... 3-14, 3-15 * 0................................................................................ 3-14 * 0 x............................................................................. 3-15 * 1................................................................................ 3-14 * 1 x x x #.................................................................... 3-15 * 2..............................
RTU-292 Operations Manual DTMF Detector.................................................. 4-22, 4-23 DTMF Generator......................................................... 4-23 DTMF Radio Control Commands...........................7-16 DTMF Response ......................................................... 5-13 dynamic peaking ........................................................... 7-6 INACTIVITY DISCONNECT TIMER ...................... 3-16 Initial Adaptation ..........................................
RTU-292 Operations Manual Maintenance and Repair................................................ 6-1 MANUAL PHONE PATCH PROCEDURE................. 3-7 Microphone Circuit ..................................................... 4-22 MISCELLANEOUS JUMPERS ................................. 2-11 Motorola URC-200 radio ............................................ 7-15 Mute .................................................................................9 PTT.........................................................
RTU-292 Operations Manual Speaker Phone Response............................................. 5-15 Speaker Radio Command.............................................. 5-7 Speaker Radio Response ............................................. 5-15 Speaker Switch Assembly........................................... 6-7 SPEAKER TO MONITOR AUDIO ............................. 3-5 SPEAKER VOLUME CONTROL ............................... 3-2 SPEECH PROCESSOR ..............................................
