User Manual 455U-D Radio Modem ELPRO Technologies Pty Ltd, 9/12 Billabong Street, Stafford Q 4053, Australia. Tel: +61 7 3352 8600 Fax: +61 7 3352 8677 Email: sales@elprotech.com Web: www.elprotech.
Contents Thank you for your selection of the 455U-D radio modem. We trust it will give you many years of valuable service. ATTENTION! Incorrect termination of supply wires may cause internal damage and will void warranty. To ensure your 455U-D enjoys a long life, double check ALL your connections with the user’s manual before turning the power on.
455U-D Radio Modem User Manual How to Use This Manual To receive the maximum benefit from your 455U-D product, please read the Introduction, Installation and Configuration chapters of this manual thoroughly before putting the 455U-D to work. Chapter Four Specifications details the features of the product and lists the standards to which the product is approved. Chapter Five Troubleshooting will help if your system has problems and Chapter Seven specifies the Warranty and Service conditions.
Contents CONTENTS WARNING ............................................................................................................................... 4 CHAPTER ONE 1.1 1.1.1 1.1.2 1.1.3 1.1.4 1.2 INTRODUCTION ..................................................................... 8 GENERAL ................................................................................................................. 8 Basic Operation ....................................................................................
455U-D Radio Modem User Manual 3.1 3.1.1 3.1.2 3.2 BEFORE CONFIGURING .......................................................................................... 29 Addressing............................................................................................................... 29 Command Mode ...................................................................................................... 30 DEFAULT CONFIGURATION ...............................................................................
Contents 3.13 3.13.1 3.13.2 3.14 AT CONFIGURATION EXAMPLES............................................................................ 55 Data Logger Network with Central Computer .................................................... 55 Unacknowledged mode with broadcast messages and repeaters. ....................... 56 SWITCH CONFIGURATION ...................................................................................... 57 CHAPTER FOUR TROUBLESHOOTING ................................................
455U-D Radio Modem User Manual Chapter One INTRODUCTION 1.1 General The 455U-D radio modem provides reliable radio modem operation with advanced communication control and diagnostics functions. Radio modems transmit serial data over a long distance via radio. The serial data is not changed - the output data is the same as the input data. Although the 455U-D is intended to be simple in its application, it also provides many sophisticated features.
Chapter One Introduction Ordering Information 455U - Type – Radio Type – RF Power – Channel – Band – Frequency 1.1.1 Type D B A C Data modem, full functionality Data modem, Bell 202 or V23 messaging External modem, 600 ohm audio input Data modem compatible with ELPRO 405U Radio Type L 10 – 500mW Power Actual power requested - for example, 100mW or 2W Channel N 12.
455U-D Radio Modem 1.1.3 User Manual Repeater Functionality A 455U-D unit can act as a repeater for other units. A repeater receives a radio message from one unit and re-transmits it on to another unit. Up to seven repeater addresses can be configured in a radio link. If transmitting to the wildcard 0 address in Unacknowledged mode (that is, a broadcast transmission), then the repeater unit can be configured to also output the data to its own host device. 1.1.
Chapter One Introduction Data received at the serial port is transmitted out of the radio port, addressed to the configured destination 455U-D module, or to all modules by using address 0. Data received from the radio with the correct addressing is transmitted out of one of the serial ports (RS232 or RS485). Prior to transmitting, units will listen to the radio channel to ensure that it is clear - units will hold off from transmitting until the radio channel is clear.
455U-D Radio Modem User Manual If the master unit does not receive the acknowledgment, the DCD output will reset. When the connection is made (DCD set), the 455U-D units can transmit data to each other.
Chapter One Introduction messages within the configured link check timeout (Configuration Setting \T), it will drop the radio link, and turn off the LINK LED, and reset the DIO and DCD signals (if configured).
455U-D Radio Modem User Manual Messages sent with encryption have an additional 16 bytes of data added to the start of the radio message (the initialization vector). 1.5 Serial and Radio Data The 455U-D module provides a full-duplex RS232 serial port and half-duplex RS485 serial port. The radio communications is half-duplex. Many applications use full duplex RS232 communications but do not require full duplex - the protocol used operates at half-duplex and will operate with the 455U-D without problems.
Chapter One Introduction will empty the input buffer too quickly, resulting in a single input message being broken into more than one output messages. Many host protocols such as those used by PLC’s, will not accept a message being broken into sections with delays between the sub-sections. To avoid this occurring, the 455U-D will automatically delay the radio transmission starting if the serial rate is less than the radio rate. This is called “PLC Mode”.
455U-D Radio Modem 1.5.4 User Manual Radio Data Rate The data is transmitted by radio as direct modulated synchronous data at 1200, 2400, 4800 9600, or 19200 bits/second - (19200 baud only operates with 25KHz channel widths). The user must configure the radio data rate at each 455U-D module. The configured radio data rates must be the same for each module in a system. The 455U-D uses four-level frequency modulation for the highest data rates - 9600 b/s for 12.
Chapter One Introduction The time taken to transmit a message is :Section PEAMBLE HEADER ENCRYPTION DATA CHECK Item Number Time (At 9600 Baud) Lead-in 40 msec Default (Configurable) 2 Bytes 2 Bytes 1 Byte 1 Byte 1 Byte per address 1 Byte 16 Bytes (if enabled) Data Bytes 2 bytes (if enabled) 40 msec System Address Header Control Source Address Destination Address Intermediate Address Header Error Check Initialisation Vector Message Data CRC Error Check 2.08 msec 2.08 msec 1.04 msec 1.04 msec 1.
455U-D Radio Modem 1.6.1 User Manual Multiple Device Connectivity (MDC) Because each serial port is individually addressed, the 455U-D is able to connect to two serial devices and manage two independent wireless links. This is called Multiple Device Connectivity, or MDC functionality. Some of the features if MDC are: Each serial port is configured individually however with the same system address.
Chapter One Introduction 1.8 Duty Cycle Limiting Some licenses require that the modem limits its communications so that it is transmitting for no more than a maximum proportion of the available time. This applies to European 500mW unlicensed bands, where the modem must limit its duty cycle to 10%. Duty cycle limit is set to 100% except for modems which are configured for the European limited duty cycle bands. To change the duty cycle limit, use the AT#D command. (AT#D100 for 100%).
455U-D Radio Modem 1.9.2 User Manual Error Check ? Error-checking may be configured in both Unacknowledged and Acknowledged mode. When the error-check is configured, a 16-bit CRC (Cyclic Redundancy Check) attached to the end of each message. This check is used to detect any corruption of the data when it is received at another 455U-D unit. Error checking is individually selected for the RS232 port and the RS485 port.
Chapter Two Chapter Two 2.1 Installation INSTALLATION General The 455U-D module is housed in a rugged aluminum case suitable for DIN-rail mounting. Terminals will accept wires up to 2.5 sqmm (12 gauge) in size. Normal 110-240V AC supply should not be connected to any terminal of the 455U-D module. Refer to Section 2.3 Power Supply.
455U-D Radio Modem User Manual some obstruction of the radio path. Obstructions which are close to either antenna will have more of a blocking effect than obstructions in the middle of the radio path. For example, a group of trees around the antenna is a large obstruction, and the antenna should be raised above the trees. However if there is at least 100 meters (300 feet) of clear path before a group of trees, the trees will have less affect on the radio path.
Chapter Two Antenna Type Installation Minimum safe distance Dipole 0.4 metres 3dBd Collinear 0.7 metres 6dBd Collinear 0.9 metres 6 element Yagi 1.2 metres 9 element Yagi 1.5 metres 16 element Yagi 2.3 metres Connections between the antenna and coaxial cable should be carefully taped to prevent ingress of moisture. Moisture ingress in the coaxial cable is a common cause for problems with radio systems, as it greatly increases the radio losses.
455U-D Radio Modem 2.2.2 User Manual Yagi antennas. A Yagi antenna provides high gain in the forward direction, but lower gain in other directions. This may be used to compensate for coaxial cable loss for installations with marginal radio path. The Yagi gain also acts on the receiver, so adding Yagi antennas at both ends of a link provides a double improvement. Yagi antennas are directional. That is, they have positive gain to the front of the antenna, but negative gain in other directions.
Chapter Two Installation B A _ 15 – 30 VDC Power Supply DC Out Earth +24 + +12 DIO Optional Battery Fuse 5A - 455U + B _ 12 – 15 VDC Power Supply DC Out A Earth +24 + +12 DIO Man_455U-D Rev 3.
455U-D Radio Modem User Manual 2.4 Serial Connections 2.4.1 RS232 Serial Port The serial port is a 9 pin DB9 female and provides for connection to a host device as well as a PC terminal for configuration, field testing and for factory testing. Communication is via standard RS232 signals. The 455U-D is configured as DCE equipment with the pinout detailed below. Hardware handshaking using the CTS/RTS lines is provided.
Chapter Two 2.4.2 Installation RS232 Configuration Port The serial port is a 9 pin DB9 female and provides configuration and diagnostics of both the local module and of other modules in the system wile the primary RS232 port is active. This port is wired as a DCE according to EIA-561. The following table describes the connections required to connect to a PC serial port. The highlighted entries in this table are those essential for operation of the Configuration port.
455U-D Radio Modem User Manual the RS485 terminals. The DIP switch should be in the “1” or “on” position to connect the resistor. If the module is not at one end of the RS485 cable, the switch should be off. 2.5 Discrete I/O Point The 455U-D provides a single connection which can be used as a discrete input for alarms, or a discrete output, to control remote equipment, 2.5.1 Using the Discrete I/O as an Output When using the DIO pin as an output, it acts as an NPN transistor to common.
Chapter Three Chapter Three Configuration CONFIGURATION 3.1 Before Configuring Configuration comprises selecting parameter values for the operation of the 455U-D unit. Before you start configuration, parameter settings must be decided. The main parameters are: Addressing - system address and unit address. Character type. You need to find out the character type of the host devices connected to the 455U-D units. The most common character type is 8 data bits, no parity, 1 start bit and 1 stop bit.
455U-D Radio Modem User Manual Each module is also configured with a unit address between 1 and 127 - this gives the module a unique identification. The two data ports on the 455U-D can be addressed based on the unit address. The RS232 port is accessed using the unit address, and the RS485 port is accessed using the configured unit address +128. So, to access the RS232 port on unit 7, use address 7. To access the RS485 port on this unit, use address 135 (128+7).
Chapter Three Configuration The opening screen shows an “empty system”. If configuring a new system, select “Add new modem configuration”. In the left hand column are the 455U units in the system. To add more units, select “System”, and “Add new modem configuration”. To load the configuration of an existing module, select “Load new modem into system” from the System screen. 3.3.1 Reading and Configuring a module You will need a connection cable between the PC and the 455U-D.
455U-D Radio Modem User Manual The cable to connect to the DB9 should have straight-through connections as per section 2.4.1 of this manual. If your PC only has USB serial connections with no RS232 port, you will need to purchase a USB to RS232 converter cable. The cable to connect to the RJ45 Config port should be wired as described in section 2.4.2 of this manual. Select the communications port that you will be using on the PC - make sure that no other program is using this com port.
Chapter Three Configuration 3.3.4 Serial Communications terminal From the Tool bar at the top of the page you can also select a basic serial communications terminal similar to Windows Hyperterminal for basic command line interface with the modem, e.g. will allow manual typing of Hayes AT commands. 3.3.
455U-D Radio Modem 3.4 User Manual Remote Configuration and Diagnostics Most of the configuration features of the 455U-D modem can be accessed remotely over the radio network. Remote configuration is accessed by connecting to the RJ-45 configuration port on the local modem, and using either the configuration software or AT commands. Refer to section 3.3.1 for information on setting up the PC Com port.
Chapter Three Configuration Using AT commands: Connection to the remote modem is accessed using the ATD command on the local RJ-45 configuration port: ATDxxx Remote Configuration and Diagnostics Access (RJ45 port only) ATD3 Access remote diagnostics on station address 3 ATD3,4,5 Access remote diagnostics on station address 5 using stations 3 and 4 as intermediate repeater stations. 3.5 Unacknowledged Mode The default setting of the program is Unacknowledged mode (refer section 1).
455U-D Radio Modem User Manual are entered into the repeater path boxes with the first repeater in the most left-hand box… and so on for multiple repeaters. For example, if you want to set up a link to remote unit 13 via units 31, 32, 33 (in this order) then you would select: If you want to use repeaters in broadcast transmissions, refer to the section on Broadcast Repeaters. If configuring with AT commands: The destination address for the RS485 port is in auto dial location 3 (AT&Z3). 3.5.
Chapter Three Configuration In this example, the destination port is the RS232 port on unit 15, via repeater 31. If using AT commands: Auto connect is set by selecting Unacknowledged mode (AT&M0) and fixed line mode (AT&L1) and by configuring a destination address into auto dial location 0 (AT&Z0). Single connect is set by selecting Unacknowledged mode (AT&M0) and deselecting fixed line mode (AT&L0). In this mode, the modem will go to command mode as soon as it is powered up.
455U-D Radio Modem 3.5.4 User Manual Broadcast Network You may want a multi-hop network to broadcast messages. This takes some care at the repeater nodes to ensure that individual repeaters do not repeat messages that they have already repeated, and also to avoid an “end-node” receiving the same message multiple times. Note - Before deciding to implement a multi-hop broadcast network, check the section below on Optimum Path Routing.
Chapter Three 3.5.5 Configuration Addressed Network Alternatively the messages can be directed through fixed addresses – using the same network as used in the broadcast above The first ring of repeaters (units 14 and 15) need to be configured as below: The “Forward Broadcast Messages” box is selected to allow these units to repeat the broadcast messages on.
455U-D Radio Modem User Manual The “Hops” box is set to 3 - this means that it will only accept messages on the third hop. If it hears a weak message transmitted from unit 1 or 14, it will ignore it. Note that the address path for return messages is <21,14,1>. 3.5.6 Multiple Transmissions Units in Unacknowledged mode may be configured to send each message multiple times. The number of transmissions is configured in S-Register S29.
Chapter Three Configuration “XON / XOFF” the modem uses the XON and XOFF symbols to control flow of data. This protocol should not be used with raw binary data, as the raw data may contain the XON and XOFF characters. This flow control method is only suitable for use with ASCII data. 3.6.3 Other Settings Select the “Modem” tab: CRC Error Checking for transmitted messages It is normal for error checking to be disabled for Unacknowledged mode and enabled for Acknowledged.
455U-D Radio Modem User Manual DCD Control The DCD signal on the RS232 port can be used to give an indication of communications link status in Acknowledged mode. Note that the link is always connected in unacknowledged mode. “Always On” - the 455U-D sets the DCD to be always on “Only High When Connected” - the DCD signal will be on when the link is connected and off when the link is reset “Pulse Low on Disconnect” - the DCD signal will be normally on but will switch off momentarily (for 0.
Chapter Three Configuration If there is no data transfer within the preconfigured “link check” time, the master will send an empty data message to check the communications link. The connection will be broken if a communication failure occurs, or if the local or remote host’s issues a “disconnect” AT command (although this would be unusual for this mode). When the master is disconnected, it will continuously try to connect to its auto-connect address.
455U-D Radio Modem 3.7.2 User Manual Auto Answer (Auto-Connect Slave) The only configuration required for an auto-connect slave module is to enter its unit address. Its address path will be automatically taken from the Connect message from the master unit. If you enter an “Inactivity Timeout” value, then the 455U-D will automatically reset the link if there has been no data transmission within this time.
Chapter Three 3.8 Configuration Dual Redundancy Two 455U-D modems can be setup to act as a dual-redundant pair. One unit configured as a Primary which is normally active, and the Secondary unit inactive. If the Primary detects an internal fault or operating problem, it will become inactive and the Secondary becomes active. Dual Redundant Standby mode is implemented in Firmware versions 3.00 and later.
5U-D Radio Modem User Manual If configuraing using Hayes commands the Dual Redundancy is set via the AT#O command (“Control digital I/O function”). Force a changeover from primary to secondary, use command AT#O5. Force a changeover from secondary to primary, use the command AT#O6. Status of the Dual Redundant system is displayed in register S33. S33 Value 2 3 4 5 6 3.8.
Chapter Three Configuration Note: The DIO channel is not available for any other purpose when the 455U unit is connected to a redundant module. If the Dual Redundant Control Connection becomes disconnected, then the two units will remain in their previous active/in-active state. Redundant units should be connected to separate power supplies and must be connected to separate antennas and coaxial cables.
455U-D Radio Modem User Manual Observe the DIO LEDs on the two modules. These LEDs should be flashing together. Refer to the following table to diagnose the flashing LEDs (Firmware version 3.
Chapter Three Configuration The following diagram shows the states of the dual redundant system, the relationship to the AT#O commands, the OK LED state, and S-registers S33 and S11 (Firmware versions 3.03 and later).
455U-D Radio Modem 3.8.5 User Manual Firmware versions prior to 3.03 Firmware version 3.03 introduced enhanced diagnostics by flashing the OK LED in synchronisation with the DIO LEDs. For firmware versions 3.00 to 3.02, refer to the following diagrams indicating the LED diagnostics and Redundancy state diagrams. LED Indicator Redundancy Status 1½ sec on, ½ sec off. Normal operation. Primary is active, Secondary is inactive but functional 1 second on, 1 second off Secondary Fault.
Chapter Three 3.9 Configuration Low Power Mode The modem can be configured for low power shutdown when the DTR signal on the data RS232 port is “reset”. In this state the supply current is reduced to approx 50% of normal load and the modem will not receive or transmit radio messages. When in low-power shutdown mode, the OK Led flashes red-green at a 2Hz rate (red 400 msec, green 100 msec). This is configured in the Modem/General screen, or using the AT&D Hayes command (AT&D3 to enable).
455U-D Radio Modem 3.10 User Manual Optimum Path Routing Optimum Path Routing (OPR) provides support for various host protocols. This mode uses knowledge of the host frame format to ensure that a full packet of information is sent over the radio in a single transmission. The host message is examined, and the destination address is extracted from the message. This is used to look-up the protocol routing paths (AT&P command configure these routing paths).
Chapter Three Configuration In the configuration below you will see that Modbus Slave address #1 is attached to remote radio #22 and the message needs to be sent via a repeater radio (#21), same with Modbus Slave Address #2 except it is attached to the remote radio #23. Modbus address #3 is attached to Remote radio #24 and communicates through two repeaters (#21 & #23). The next three Modbus Slaves are all connected to the same remote radio (#25) and each link needs a separate configuration.
455U-D Radio Modem User Manual 3.10.3 Modbus RTU Protocol When configured for Modbus RTU Protocol, the modem ignores the configured Rx Timeout value, and sets it to the correct value for the Modbus RTU protocol. 3.10.4 Modbus ASCII protocol The correct value for serial timeout in the Modbus ASCII protocol is 1 second, however, this is normally too long. Setting the serial timeout value to 0 causes the actual serial timeout to be 1 second. Otherwise, the configured value is used.
Chapter Three Configuration Once in configuration mode, the 455U-D unit will accept a string of Hayes commands, and the configuration changes made. The changes will not however be stored in permanent memory (EEPROM) unless the Hayes command for recording the configuration (AT&W) is sent.
455U-D Radio Modem User Manual AT&U1 – Set unit address to 1. Remote Modems configuration AT&M1 – Configure Acknowledged Mode AT&E1 – Enable Error checking ATS0=1 – Enable Auto Answering on first attempt. AT&U2, AT&U3, etc – Set unit address to 2, 3, 4, etc for each remote modem. 3.13.2 Unacknowledged mode with broadcast messages and repeaters. This example demonstrates how to broadcast messages to the entire system using unacknowledged mode.
Chapter Three Configuration repeaters don’t clash with responses from the directly communicating device (address 15). This command sets the repeater to 200 msec hold-off. Slave Repeater station address 21 AT&M0 - Configure mode 0 – Unacknowledged mode. AT&L1 – Go directly online at start-up AT&21 - Set Modem’s address to 21 AT&Z0=14,1 - Set all data to go through address 14 to master station, address 1.
455U-D Radio Modem User Manual Chapter Four TROUBLESHOOTING 4.1 Power-up and Normal Operation When power is initially connected to the 455U-D module, the module will perform internal diagnostics to check its functions. The following table details the status of the indicating LEDs on the front panel under normal operating conditions.
Chapter Four Troubleshooting 4.2 LED indication Diagnostics Chart INDICATOR CONDITION MEANING OK LED OFF Continuously Power supply failure Battery Supply Overvoltage OK LED RED Briefly Module Out of buffer memory (Host device ignores CTS) Low Supply Current during transmit (Modem resets) OK LED RED Continuously – from startup CPU Failure Radio module fault.
455U-D Radio Modem User Manual Green flash RS485 serial port receiving data from host device Orange flash† RS485 Serial Port Activity (Older version Hardware) † DCD LED OFF Continuously No Radio Link established. DCD LED GREEN Continuously Modem is online & ready to transmit. In Acknowledged mode, a radio link has been established. DCD LED RED Continuously Modem is in Command mode, but has a radio link established.
Chapter Four Troubleshooting If large radio messages are being transmitted, reduce the maximum message length, and transmit the data in more messages of smaller size. Another common problem is the response time of the host software. Some hosts operate by sending a message from one end and require a response to that message within a certain time. If this time is less than the turn-around time of the radio modem, then the system will not operate.
455U-D Radio Modem User Manual Using AT Commands BER may be tested by typing AT#B (Slave Address). The sending unit will repeatedly send pseudo-random frames, and the receiving unit will check these frames for errors. The receiving unit returns a response message indicating how many (if any) errors were found. The test results are displayed on the sending unit. To test Communication to slave station 13, enter AT#B13. To test slave station 14 using station 13 as a repeater, AT#B13, 14 etc.
Chapter Four Troubleshooting AT&T5 - Received Signal Strength Display This option provides for testing the radio path between two 455U-D units. Although a pair of units may communicate successfully, radio communication may be affected by a range of influences, including atmospheric conditions, changing landscape, degradation of antennas or co-axial cable, low battery voltage etc. Fade margin is an indication of how far a radio path can deteriorate before reliable communication becomes unreliable.
455U-D Radio Modem User Manual S-Register Meaning S9 Radio signal strength of last radio message received S12 Reason for radio link resetting in Acknowledged mode - refer App C for codes. S31 Radio Flags, 0 for All OK, Otherwise some Radio faults.
Chapter Four 4.5 Troubleshooting Radio Path Testing To carry out a radio path test, you will need two 455U modules. One module will be “fixed” and the other “mobile”. Both units will need power supplies and antennas. The power supply for the mobile unit is normally a 12V battery, but make sure that the battery is fully charged batteries with low voltage will lead to low radio power which will affect the test result.
455U-D Radio Modem User Manual system, in a good location to act as a repeater. If this is not the case, you need to consider installing a module to act specifically as a repeater. 4.6 Changing the Radio Parameters It is possible to change the radio Transmit and receive frequency and the radio power setting from the configuration software (Select the “Radio” tab, and enter new values for TX Frequency and RX Frequency).
Chapter Four Troubleshooting 4.7 Diagnostic Messages The modem is configured to print diagnostic messages out the RS-232 Configuration port. At startup, this port displays the following messages. Firmware Version ELPRO E455U V3.
455U-D Radio Modem User Manual Chapter Five SPECIFICATIONS General EMC specification EN 301 489 FCC Part 15 Radio specification EN 300 113 RSS-119, AS 4768.1 EN 300 220 FCC Part 90, AS4295 140 x 114 x 30mm Powder-coated, aluminum 5.5 x 4.5 x 1.2 inch DIN rail mount Terminal blocks Removable Suitable for 2.
Chapter Five Receive Sens (BER 10-3) 12.5KHz channel Specifications -106 dBm 9600 Baud -112 dBm 4800 Baud -114 dBm 2400 Baud -116 dBm 1200 Baud Signal detect / RSSI -120 to -60 dBm Expected line-of-sight range 30 km @ 19200 baud (25Khz) @ 5W 35 km @ 9600 baud (12.5Khz) Range may be extended by up to 6 intermediate modules as repeaters.
455U-D Radio Modem Chapter Six User Manual WARRANTY & SERVICE We are pleased that you have purchased this product. ELPRO products are warranted to be free from manufacturing defects for the “serviceable lifetime” of the product. The “serviceable lifetime” is limited to the availability of electronic components.
Appendix A Response Codes Appendix A Hayes Commands The following details all of the Hayes commands supported by the 455U-D. Default settings are shown by a “dot”, Command Function ATA Answer Incoming Call – The modem can also be set to answer incoming calls immediately or after a certain number of attempts. (See S-Register S0) ATB Set Radio Baud Rate – Radio Baud rates are 1200, 2400, 4800, 9600 and 19200 baud. Some baud rates may not be possible for some country codes.
455U-D Radio Modem User Manual ATD Connection/Dialing Control. Dial a specific remote or a stored number. This command has a different effect depending on whether it is issued from the RS232 main serial port (connects to the remote modem’s serial ports) or from the Diagnostic serial port (Connects to the remote modems diagnostic functions). ATE Local Echo Control. Enable/Disable Command Echo.
Appendix A Response Codes R12 Set 76,800 baud R13 Set 93,750 baud (For Profibus) R14 Set 115,200 baud R15 Set 187,500 baud (For Profibus) ATSn? Read value from S-Register n (Refer to Appendix C) ATSn=xx Set value of S-Register n to xx (Refer to Appendix C) ATV Verbal/Numeric Response Codes (RJ-45 port always has verbal responses) V0 Numeric response codes on RS-232 serial port V1 Verbose response codes on RS-232 serial port ATX Extended Response Codes.
455U-D Radio Modem User Manual #E0 Disable security encryption #E1 Enable security encryption on transmitted messages #E2 Enable security encryption on transmitted messages and enforce encryption on received msgs. AT#N Enter Module Serial Number (11 characters Max) (Requires Radio Access AT#R to change).
Appendix A Response Codes &C1 DCD High when connected (Acknowledged Mode) or when online (Unacknowledged mode). Low otherwise. &C2 DCD Always on, Pulses low on Disconnect (Acknowledged Mode) or on Hangup (Unacknowledged mode). AT&D Data Terminal Ready (DTR) Behavior. The host controls DTR. This command controls how the modem reacts to the state of DTR. &D0 Modem ignores DTR, and acts as if it is asserted. &D1 If the host lowers DTR, the modem returns to command mode, but does not disconnect.
455U-D Radio Modem User Manual &K1 CTS/RTS Flow Control. CTS follows RTS high if there is space in the local buffer. Otherwise CTS goes low. On Serial Transmit, CTS goes high, and waits for RTS to go high before transmitting. Note: Currently not implemented (Behavior is as for &K3) &K2 CTS/RTS Flow Control. CTS Reflects the state of the remote buffer, AND the local buffer, AND the remote RTS input. The modem only transmits serial data when RTS is high. RTS input is transferred to the remote modem.
Appendix A Response Codes attempt if a character is entered. This item is only meaningful with the acknowledged mode of operation. &N0 Ignore characters entered while attempting to make a connection. &N1 If a key is hit while attempting to connect, abort the connection attempt and return to command mode. AT&P Protocol Routing Paths – Up to 100 paths can be stored.
455U-D Radio Modem User Manual &T0 Stop Tone reversals (See T1 to T4 below). &T1 Transmit tones Modulated at 200 Hz &T2 Transmit tones Modulated at 2400 Hz &T3 Transmit Tones Unmodulated &T4 Transmit Random Modulated tones at current radio baud rate &T5 RSSI Measurement. Monitors the received signal strength, and displays in dBm. AT&V View Current Configuration – List the value of all settings as well as S-Registers (except &P settings).
Appendix A Response Codes 5 Watt Radio .500 mW Radio \P0 Set Radio to 500 mW Set Radio to 10mW \P1 Set Radio to 1 W. Set Radio to 25 mW \P2 Set Radio to 2 W Set Radio to 100 mW \P3 Set Radio to 5 W. Set Radio to 500 mW AT\K Break signal handling control (Currently not implemented) AT\B command from online Host sends break on serial \K0 Purge Buffers & send break Enter command state & purge Purge buffers and send buffers. Don’t send Break. break to host.
455U-D Radio Modem User Manual selects extended response codes. ATQ0 disables all response messages. ATQ1 enables response messages. The following table describes the messages. A symbol indicates that messages is displayed for the corresponding ATX setting. Numeric Code Verbal Message ATX setting Comments X0 X1 X2 X3 0 OK 1 CONNECT Valid Command Entered Connection established.
Appendix C S-Registers Appendix C S-Registers The following table lists the S-Registers supported by the 455U-D modem. No. Range Function Comment S0 0-255 Attempts before Answering Call Should normally be set to 1. 0 disables auto answering of calls (ATA command to answer calls only). S1 3-255 Escape Sequence Guard Time Units 20 milliseconds. Min. Delay before and after entering the escape sequence (“+++”) also Max. Delay between characters of the escape sequence.
455U-D Radio Modem User Manual S12 = 5 No response to dial request to remote modem. S12 = 6 “BUSY” response from remote modem on dial request. S12 = 7 Character received from host while attempting to connect S12 = 8 Hang-up from remote modem. S13 0-255 Spare Function Not Implemented S14 0-255 Max Packet (0–1020 bytes) Max Packet size = S14 x 4. Default 255. S15 0-255 Break Length Minimum time to send “BREAK” signal. Units 20 milliseconds.
Appendix C S-Registers S25 0-255 System Address – Low Byte The 16-bit system address uniquely identifies the radio network S26 0-255 Lead-In Tone Time This selects the Lead-In tone period – units 4 msec. The default (10) should not normally be changed.
