PN 88300150 MT2834MR, MT2834MRI, and MT2834MRK Owner’s Manual 4/3/01 1
PN 88300150 MT2834MR, MT2834MRI, MT2834MRK Owner’s Manual MOD PN 88300150 Version 1.00 - 4/3/01 (Replaces Manual PN 82035706 Rev. G) This publication may not be reproduced, in whole or in part, without prior expressed written permission from MultiTech Systems, Inc. All rights reserved. Copyright © 1996, by Multi-Tech Systems, Inc. Multi-Tech Systems, Inc.
PN 88300150 CHAPTER 1 - INTRODUCTION AND DESCRIPTION 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.10 1.11 1.12 Introduction .................................................................................6 How To Use This Manual ...........................................................6 Description ..................................................................................7 FCC Regulations for Telephone Line Interconnection................8 Canadian Limitations Notice ..................................
PN 88300150 5.13 5.14 5.14 5.15 5.16 5.17 Compression, Error Correction, Flow Control,..........................53 Pass Through and Pacing Commands .....................................54 Error Correction Result Codes..................................................54 Speed Conversion ....................................................................55 Related Commands ..................................................................55 Summary............................................................
PN 88300150 1.1 Introduction Welcome to the world of data communications. You have acquired one of the finest rack-mount intelligent modems available, the MT2834MR, from Multi-Tech Systems. This owner’s manual will help you install, configure, test, and use your modem. Your MT2834MR is designed to operate in two modes. First, it functions as a 33,600 bps leased line modem with dialback security. Communications over leased lines have been popular for many years primarily over 4-wire lines using V.
PN 88300150 Chapter 6 - Testing Your Modem This chapter provides information on loopback testing for your MT2834MR. Chapter 7 - DIP Switches and Jumpers The MT2834MR’s printed circuit board options are covered in this chapter. The DIP switch settings and on-board jumper plugs are explained in detail, including all default settings.
PN 88300150 1.4 FCC Regulations for Telephone Line Interconnection 1. No repairs are to be made by you. Repairs are to be made only by Multi-Tech Systems or its licensees. Unauthorized repairs void registration and warranty. Contact Multi-Tech Systems, Inc. for details of how to have repairs made. 2. When trouble is experienced, you must disconnect your modem from the telephone company’s jack to determine the cause of the trouble, and reconnect your modem only when the trouble is corrected. 3.
PN 88300150 Repairs to certified equipment should be made by an authorized Canadian maintenance facility designated by the supplier. Any repairs or alterations made by the user to this equipment; or equipment malfunctions, may give the telecommunications company cause to request the user to disconnect the equipment.
PN 88300150 ii. external control software or external control apparatus which cause the operation of the modem associated call set-up equipment to contravene the requirements of the standard set out in BABT/SITS/82/005S/D. All apparatus connected to this modem and thereby connected directly or indirectly to the British Telecom public switched telephone network must be approved apparatus as defined in Section 22 of the British Telecommunications Act 1984. Compliance with BS6789: Section 3.1 and Part 2 a.
PN 88300150 This apparatus has been approved for the use of the following facilities: ·Auto-calling ·Loop disconnect and MF dialing ·Phone number storage and retrieval by a predetermined code ·Operation in the absence of proceed indication ·Detection of initial and secondary proceed indication ·Automatic storage of last number dialed ·Tone detection-busy ·Auto clear from the originating end ·DTR dialing ·Modem ·PBX timed break register recall Any other usage will invalidate the approval of the apparatus if
PN 88300150 Automatic Dialing Choice of “Standard AT” command asynchronous dialing, “AT” commandcontrolled asynch-to-synch DTR dialing, or ITU-T V.25bis Synchronous or Asynchronous dialing. Automatic Leased Line Restoral When in dial back-up mode, modem will attempt leased line restoral periodically according to software configuration.
PN 88300150 Transmit Level -10 dBm (dial-up) 0 dBm (leased line, MT2834MR) -13 dBm (private wire MT2834MRK) -11dBm (MT2834MRI) Note: The Transmit Values apply to the domestic, U.K., and the standard International defaults only, country-specific modems may vary. Frequency Stability +0.01% Receiver Sensitivity -43 dBm under worst case conditions AGC Dynamic Range 43 dB Interface EIA RS232C Diagnostics On-line Diagnostics ITU-T V.54 Remote Loop, V.
PN 88300150 1.9 Modem LED Indicators The MT2834MR has fifteen LED indicators. They are: 1. Transmit Data (XMT). This LED blinks when data is being transmitted, on for a space, off for a mark. The state of this LED matches that of the XMT circuit on Pin 2 of the RS232C interface. 2. Receive Data (RCV). This LED blinks when data is received, on for a space, off for a mark. The state of this LED matches that of the RCV circuit on Pin 3 of the RS232C interface. 3. Carrier On (CD).
PN 88300150 1.11 Controls on PC Board The MT2834MR modems contain three 16-position DIP-Switches and several jumper plugs. The DIPSwitches control various modem options or set default values for Command mode operation. There are also “jumper” option settings on the circuit board, which control V.54/Test (OOS) functions. The toggle switch positions on the MT2834MR are be labeled “Busy” for each of the three on-board modems (Modems A,B,C).
PN 88300150 2.1 Introduction This chapter describes the dialing and answering capabilities of the MT2834MR. Since the modem can be either a leased line with dialback modem or a standard ITU-T V.34 full duplex dial-up modem, both modes are described (in terms of dialing features) in this chapter. 2.
PN 88300150 The purpose of the timer for the Answer modem is to determine when it will accept a dial-up call. When both timers have expired and the leased line has not been established the dialback procedure will start. The number dialed is the one stored in location N9 of the originate modem’s phone number memory. In preparation for proper dialback operation, you must enter the proper number in the N9 location using the commands detailed in Chapter 3. Keep in mind that the number also can be a V.
PN 88300150 2. DTR Control. If DTR (Data Terminal Ready) is turned off for 50 milliseconds or more, a disconnect will occur. This is probably the most common method used by computer systems at the automatic answer end of the line to cause the answering modem to disconnect after log off procedures. 3. Loss of Carrier. After a data connection has been established, the modem will disconnect if a loss of carrier occurs for 700 milliseconds (.7 seconds) or more.
PN 88300150 3.1 Introduction The MT2834MR incorporates a microprocessor-based Command Mode, which allows you to use your computer keyboard or communications software to interact with your modem. When your modem is in Command mode, you have access to a complete communications system which allows you to use a number of features including the basic AT command set described in this chapter.
PN 88300150 3.4 AT Commands A variety of autodial operations and modem options are controlled when the MT2834MR is in Command Mode. This chapter covers each command in detail. There are also several option configurations stored in “S-Registers”, which can also be accessed in Command Mode (refer to Chapter 6). Error Correction commands are covered in Chapter 5 of this manual. The MT2834MR commands are listed below in alphabetical order.
PN 88300150 $MBn Nd NdNe O P &Pn #Pn Qn &Qn Rn &Rn *Rn &RFn $Rn S= S? $SBn &Sn &SFn $SP T #T &Tn U Vn #V W &Wn X &Xn Yn Z +++ , ; ! @ +++AT BREAK AT Modem Baud Rate Dial Stored Telephone Number Number Linking On-line from Command Mode Pulse Dial Set Pulse dial ratio* Parity Select Result Codes Command set select Reverse this mode CTS control Ring message on callback modem CTS follow RTS control Retransmit count S-Register, set value S-Register, read value Serial port Baud rate DSR control DSR follo
PN 88300150 3.5 Result Codes You can choose result codes that closely match those of the “Standard AT” command set (“Standard AT” Responses) or enhanced function result codes that have been used in Multi-Tech modems in the past (“Multi-Tech responses”). The &Q command selects which result codes will be used. The Command mode provides you with several responses, or “Result Codes,” that can aid you in Command mode operation. These Result Codes are displayed on your monitor or printout.
PN 88300150 3.6 Command Mode Fundamentals This section discusses Command Mode fundamentals, Dialing commands, Immediate Action commands (except dialing), and Configuration commands. The rest of the commands are covered in Chapter 5. 3.6.1 Entering and Executing Commands When you type commands for the MT2834MR, each command must start with the Attention Characters AT. Attention characters can be typed in either upper case (capital) or lower case (small) letters.
PN 88300150 3.7 Dialing Commands 3.7.1 Dialing Action Commands D Dial Command The letter D in a command causes the MT2834MR to dial the telephone number immediately following it. For example, if you type ATD5551212 and hit ENTER, the MT2834MR dials the number 555-1212. The D command is also used in conjunction with a telephone set for manual dialing. You dial the number on your telephone set, and after hearing the answer tone on your handset, type ATD on your keyboard and hit ENTER.
PN 88300150 3.7.2 Dial Modifiers There are several commands that can be included within a dialing command (following the letter D), called “dial Modifiers”. They have various functions, including the selection of Pulse or Tone dialing, pauses in the dial sequence, automatic redials if a number is busy, and reverting to Command mode or switching to Answer mode after dialing. P, T Pulse or Tone Dialing The MT2834MR can dial numbers using either pulse or tone dialing, or a combination of both methods.
PN 88300150 It is not necessary to type a W at the beginning of the dialing command to wait for a modem dial tone, since the modem will pause automatically. In order for this command to work, you must first select Wait-for-Dial-Tone dialing with the X2 or X4 command, so that your modem can detect the dial tone.
PN 88300150 For example to store the number 1-612-631-3550 as number N3, type ATDT16126313550N3 and hit ENTER. The number is not dialed with this store command. After storing a phone number, check if it has been stored correctly by typing ATL and hitting ENTER. When phone numbers are stored, the entire command line is also stored so that you can effectively create a macro for each number.
PN 88300150 3.8 $H Immediate Action Commands Help Screens The $H command gives you short explanations on how to use each MT2834MR command. The $H command can be quite useful if your manual is not handy and you are in the middle of a communications session. Although the explanations are quite abbreviated compared to those in this manual, they should prove to be helpful reminders when needed.
PN 88300150 Note: The Escape Code for Remote Configuration (see Appendix K) has %%%AT for the factory default setting. O Exiting Command Mode, Going Back On-Line To bring the MT2834MR out of Command mode back into On-Line mode, type ATO (where O is the letter O, not the number 0). In this case, the O command reverses what was done by typing the Escape Code. The O command places the modem in the same On-Line mode (Originate or Answer) that it was in prior to going into Command mode.
PN 88300150 3.9 Configuration Commands 3.9.1 Configuration Storage and Default Commands &F Loading Factory Defaults Because the modem has the capability of storing reconfigured parameters and S-Register values into its non-volatile Random Access Memory (RAM), you may wish to have a choice between these RAM stored parameters and values or the factory default parameters and values (as determined by the modem’s ROM and DIP-Switches). The &F command lets you set the modem to the factory defaults in ROM.
PN 88300150 3.9.2 Command/Response E Echoing Command Mode Characters If the MT2834MR is connected to a full-duplex terminal or computer, you may have to configure the modem to echo back characters typed while in Command mode in order for them to be displayed. The E command is used to configure the Command mode echo, with ATE0 disabling the echo and ATE1 enabling the echo.
PN 88300150 the Extended set provides several responses (CONNECT, CONNECT 1200, CONNECT 2400 and CONNECT 9600). Regarding the method of dialing, the MT2834MR can detect standard dial tones and busy signals. This capability (“smart dialing”) allows the modem to wait for a dial tone, and when one is detected, to begin dialing immediately. The MT2834MR also can detect a distant busy signal if after dialing, it reaches a busy number.
PN 88300150 3.9.3 RS232 Interface Commands &C Carrier Detect Control The &C command lets you control the status of the Carrier Detect signal (CD - Pin 8) on the RS232C interface. You have three choices. You can force the signal high, allow it to act normally, or set it up so that it will stay high until the modem disconnects, go low momentarily, and then go high again. The last option is useful with some CBX phone systems and mainframe front ends, which require CD to act in this manner.
PN 88300150 RTS. Refer to the &R command for control of Clear to Send functionality. The factory default setting is &RF1. &S Data Set Ready Control The &S command lets you control the status of the Data Set Ready signal (DSR - Pin 6) on the RS232C interface. You have three choices. You can force the signal high, allow it to act normally, or set it up so that it will stay high until the modem disconnects, go low momentarily, and then go high again.
PN 88300150 B Bell or ITU-T Tone You can use the B command to select the frequency that the modem uses for its answer tone. (The answer tone is the tone transmitted by a modem receiving a call to the modem that called it, which initiates the handshaking between the two modems.) At higher speeds (2400 to 14.4k bps) there is no conflict, because all use ITU-T frequencies. At lower speeds (0-1200 bps), in the U.S., some modems use the Bell frequency of 2225 Hz. However, the ITU-T specification for V.
PN 88300150 $MI MI/MIC Control The $MI command enables and disables the mode indicate/mode indicate common interface function. AT$MI1 enables MI/MIC operation and AT$MI0 disables it. With the MI/MIC option enabled, the modem’s A and A1 telephone line interface output leads are replaced with MI and MIC input leads. (Tip and Ring remain unaffected.) When MI and MIC are connected together, the modem goes Off Hook in Originate mode, for a time period specified by the modem’s Abort Timer (S-Register S7).
PN 88300150 $EB Asynchronous Word Length Command The MT2834MR has an 11-bit capability when operating asynchronously. The $EB command selects between 11-bit and 10-bit operation. Type AT$EB1 to enable the modem to function in an 11-bit (one start bit, eight information bits, one parity bit and one stop bit) format. Type $EB0 (the default setting) to enable a 10-bit (one start bit, seven information bits, one parity bit and one stop bit) format. $EB is functional in both Command and On-line mode.
PN 88300150 &I1 Resets the Inactivity Timer when data is received from the other modem. &I2 Resets the Inactivity Timer when the modem transmits. &I3 Resets the Inactivity Timer when data is either transmitted or received. The factory default setting is &I0. *C Note: Caller ID Detection The Caller ID detection feature is optional. The Call Traffic window will display the phone number and the name of an individual that dials in on a phone line that supports Caller ID.
PN 88300150 With the *R1 command, the modem will put out a ring message and raise pin 22 on the RS232. *R0 No ring message on outbound callback attempt. *R1 Ring message and pin 22 enabled on outbound callback attempt. The factory default setting is *R0. #V User Control of V.32terbo in Answer Mode #V0 V.32terbo enabled. #V1 V.32terbo disabled. The factory default setting is #V1. Note: The bits that are used in the rate sequence words for V.32terbo can cause handshaking to fail with some V.
PN 88300150 4.1 Introduction This chapter covers MT2834MR software registers called S-Registers, where certain MT2834MR modem and Command mode configurations are stored. Each S-Register is assigned a number (S0, S1, S2, etc.). Use the S command to read and/or change the value stored in an S-Register (ATSr? to read and ATSr= to change S-Register values). Refer to Section 4.2, Reading and Assigning S-Register Values.
PN 88300150 S4 Line Feed Character Unit: Range: Default: Description: ASCII 0-127 10 S4 defines the character recognized as Line Feed. The default setting is CTRL-J (Decimal 10), which is the ASCII code for the Line Feed key on most keyboards. S4 may be set for any ASCII character. S5 Backspace Character Unit: Range: Default: Description: ASCII 0-127 8 S5 defines the character recognized as BACKSPACE. The default setting is CTRL-H (Decimal 8), which is the BACKSPACE key on most keyboards.
PN 88300150 S9 Carrier Detect Response Time Unit: Range: Default: Description: 100 mSec. 1-255 6 S9 sets the time delay between when the modem first detects a valid incoming carrier signal and when the modem turns on its Carrier Detect circuit. The default setting is 600 milliseconds, or six units of 100 mSec each (Decimal 6). S9 may be set for up to 25.5 seconds. S10 Carrier Loss Disconnect Delay Time Unit: Range: Default: Description: 100 mSec.
PN 88300150 S18 Automatic Leased Line Restoral Unit: Range: Default: Description: 1 min. 10-255 min. 30 min. When the MT2834MR is in the dial back-up mode of operation, it will periodically check the leased line to see if it’s operational and try to restore the leased line if possible. The frequency of restoral attempts is defined by the contents of S-Register S18. The default for S18 is 30 minutes and can be set in one minute increments from 10 to 255 minutes.
PN 88300150 S30 Inactivity Timer Unit: Range: Default: Description: 1 min. 0-255 0 S30 causes the modem to disconnect if no data is transmitted or received for a specified time. This timer runs during both Reliable and Normal connections. The timer restarts any time a data character is passed through the serial port (either sent or received). If noise on the phone line causes an error to be received during Normal mode, this also restarts the timer.
PN 88300150 S48 Control V.34 Connect Speed Unit: Range: Default: Description: 4.2 N/A 28, 26, 24, 21, 19, 16, 14, 12, 96 and 48 0 S48 defines the speed at which the modem connects within V.34 mode. For example, S48=21 means that the maximum connect speed is 21.6K bps. S48 compensates for line conditions that have trouble supporting the higher V.34 speeds (e.g., 26.4K, 24K bps, etc). The S48 default is 0, which indicates a connection attempt at 28.8K bps. Note that the $MB command is also used for V.
PN 88300150 The MT2834MR stores its configuration parameters and S-Register values in its nonvolatile memory. The &W0 command stores current parameters and values in its nonvolatile RAM. This command also sets the modem so that on power up, or when reset with an ATZ command, the modem reads all its configuration and S-Register parameters from RAM, and not from the factory settings in ROM. The &W command changes the configuration parameters stored in RAM that you specifically intend to alter.
PN 88300150 5.1 Introduction Your MT2834MR has intelligent features beyond those of the AT command set (described in Chapter 3 of this manual). This chapter covers these high performance features and commands which provide error correction, data compression and speed conversion capabilities. Error correction in your modem is via the ITU-T V.42 standard. Data compression in the MT2834MR is either MNP Class 5 or ITU-T V.42bis.
PN 88300150 For all practical purposes, the result of the V.42 error correction protocol is error-free transmission. Using the 16-bit redundancy check, it will detect every error which is 16 bits or smaller, with 100% probability. As a result, the chances of an error occurring are actually so small that you can, in practice, ignore them. 5.3 Data Compression The MT2834MR has both V.42bis and MNP class 5 data compression. ITU-T V.
PN 88300150 5.5 V.42 Mode Select Command (#L) The V.42 Mode Select command (#L) selects which type of error correction your MT2834MR will use for transmissions. The V.42 standard implements both MNP Class 3 & 4 and LAP-M error correction protocols, and by executing one of the #L commands you are instructing your MT2834MR how to operate with each protocol. For example, the factory default setting (#L0) tells your MT2834MR to negotiate the protocol with the remote modem, and to prefer MNP 3 & 4.
PN 88300150 Auto-Reliable Mode (&E1) In Auto-Reliable mode, the MT2834MR will, during the handshaking procedures at the start of the on-line connection, automatically determine whether or not the modem with which it is communicating is using the error correction. If the MT2834MR determines that the other modem is using V.42, it will switch itself into the Reliable (V.42) mode of operation. If it is determined that the other modem is not using V.42, the MT2834MR will remain in Normal mode.
PN 88300150 lead on the RS232C interface (Clear to Send - Pin 5). Most terminals and computers support one or both of these methods. Xon/Xoff Flow Control (&E5) Xon/Xoff is the most commonly-used method of flow control. Under this method, control characters known as “Xon” and “Xoff” are inserted by the modem into the data to start and stop the flow of data from the computer or terminal to which the modem is attached. Xoff, (CTRL-S), stops the flow of data, and Xon, (CTRL-Q), restarts it.
PN 88300150 When Xon and Xoff commands are allowed to pass through the modem, the computer (or terminal) at the remote site receives these commands, and depending on how it is configured, the computer (or terminal) may respond to them also. 5.11 Normal Mode Modem Flow Control (&E10 and &E11) When two MT2834MR’s are connected in Normal mode (not using error correction), Xon/Xoff can be used to control the flow of data between the modems.
PN 88300150 &E11 = Normal Mode Modem Flow Control (Xon/Xoff) on Computer (or Terminal)-Initiated Flow Control(Pacing) Commands: &E12 = Pacing off &E13 = Pacing on (either RTS on/off or Xon/Xoff depending on the setting of &E4 or &E5).* *Factory default setting **The factory default setting for data compression is enabled, but the modem will not compress data (&E15) unless &E1 (auto-reliable mode) or &E2 (reliable mode) is also selected.
PN 88300150 CONNECT 26400 LAPM 26L CONNECT 28800 LAPM 28L CONNECT 31200 LAPM 31L CONNECT 33600 LAPM 33L These responses replace the CONNECT (1), CONNECT 1200 (5), CONNECT 2400 (9), CONNECT 4800 (11), CONNECT 9600 (12) and CONNECT 14400 (13) responses that the modem uses when in Normal mode. When data compression is enabled, the word COMPRESSED (verbose) or letter C (terse) are also added to these responses. In addition to these responses, the V.
PN 88300150 Note: Do not be misled by the meaning of turning Baud Adjust “off”, even though the term “Baud Adjust” sounds like it should mean the same thing as “Speed Conversion”. It actually means the opposite: Turn Baud Adjust off to turn Speed Conversion on. Turn Baud Adjust on to turn Speed Conversion off. To turn Baud Adjust on (and Speed Conversion off), enter AT$BA1 and hit ENTER.
PN 88300150 command speed, although the baud rate value stored by the $SB command will remain the same. This provides you with a convenient way to switch the serial port speed, while still making it easy to go back to the original speed automatically the next time the modem is powered up or reset with an ATZ command.
PN 88300150 commands can be used together to cause the modem to buffer all data received up until the CARRIAGE RETURN and then drop to Normal mode. All data received will then be output following the CONNECT message. Type AT$F0 to cause the modem to not fall back to normal connect if a CARRIAGE RETURN is received. Type AT$F1 to cause the modem to fall back to normal connect if a CARRIAGE RETURN is received. The factory default setting is $F1.
PN 88300150 The MT2834MR can be set for three different modes of operation, along with activating data compression in Reliable mode. Normal mode disables error correction, Reliable mode enables it, and Auto-Reliable mode allows the modem to automatically turn V.42 on when it detects its use in another modem. Flow control methods are used by the MT2834MR to prevent data loss from buffer overflow.
PN 88300150 6.1 Introduction Each time you power up the MT2834MR, it performs an automatic self- test to ensure proper operation. The MT2834MR also has four diagnostic test features: Local Analog Loopback, Digital Loopback (remote/automatic), Digital Loopback (local/manual) and a modem Back-to-Back test. The CCITT V.54 Loopback Testing capability supports telephone circuit and transmission problem isolation. If Pin 8 on the RS232 interface goes high, the MT2834MR goes into analog loopback mode.
PN 88300150 6.2 Local Analog Loopback Test/V.54 Loop 3 In this test, data from your computer or terminal is sent to your modem’s transmitter, converted into analog form, looped back to the receiver, converted into digital form and then received back at your monitor for verification. No connection to the phone line is required. See Figure 6-1. Figure 6-1. Local Analog Loopback Test The test procedure is as follows: 1. Disable Error Correction by typing the &E0 command. 2.
PN 88300150 6.3 Digital Loopback Test/V.54 Loop 2 (Local/Manual) In this test, your modem must be On-Line with another modem that can respond to a request for Digital Loopback, such as another MT2834MR. The Digital Loopback Test is an on-line test that loops data sent from one modem across the phone line to another modem, then back to the first modem. See Figure 6-2. There are two ways to put a modem into Digital Loopback mode. 1. Locally or Manually, described here in section 6.3. 2.
PN 88300150 6.4 Digital Loopback Test/V.54 Loop 2 (Remote/Automatic) In this test, your modem must be On-line with another modem set up to respond to a request for Digital Loopback, such as another MT2834MR. With the MT2834MR, this ability to respond is controlled by the &T command. AT&T4 enables the response to Digital Loopback Test (remote/automatic). AT&T5 disables the response.
PN 88300150 6.5 Back-to-Back Test This test lets you connect two MT2834MRs with an RJ11 cable to verify proper operation. Using a MT2834MR that is known to be operational, you can test a second MT2834MR that is suspect. 1. Plug the modular ends of an RJ11 cable into both MT2834MR’s LINE jack connectors. 2. Force DTR ON in both local and remote modems (Switch #1 DOWN). 3. Enter the command AT$SB9600$BA0&W0 on both local and remote modems. This sets the serial speed to 9600bps.
PN 88300150 6.6 Synchronous Mode Testing The following tests must be run with your modem in Synchronous mode (DIP Switch #12 in the Up (OPEN) position), DIP Switch #9 controls the modem’s Synchronous mode testing function. (Refer to Chapter 9 for DIP Switch information.) The test procedures for Synchronous mode are different from those for Asynchronous mode. In Synchronous mode, you cannot access the modem’s AT commands.
PN 88300150 6.8 Digital Loopback Test (Local/Manual) (Synchronous Mode) This test must be run when you have a data connection with another modem. If a Local Analog Loopback Test resulted in errors, and this test passes without errors, then the problem exists in your computer-tomodem connection.
PN 88300150 7.1 Introduction There are 3 sets of DIP-Switches and 3 two-position jumpers on the MT2834MR card. To remove the MT2834MR modem card from the CC4800 rack, pull the ejector levers away from the rack (if necessary loosen the retaining screw first), then carefully slide the modem card out of the rack. The DIP-Switches are used to enable or disable various user-selectable options. Each DIP-Switch is set to a factory default setting that is useful in most applications.
PN 88300150 7.2 16-Position DIP-Switches The MT2834MR PC board contains three pairs of DIP-Switch blocks. Each pair of DIP-Switch blocks is numbered 1-12 and 13-16, and each pair of DIP-Switch blocks is related to each of the three on-board modems, as shown below. Figure 7-2. DIP-Switches 7.3 16-Position DIP-Switch Settings Each individual switch, numbered 1-12 and 13-16, and can be set to either the Up (marked “OPEN”) or Down position.
PN 88300150 Switch #2 Flow Control - &E4/&E5 (Asynchronous Mode/Leased Line/Dial-Up) With Hardware Flow control, the modem uses its RS232C/V.24 interface to control the flow of data from the computer or terminal to which it is attached. CTS signal on Pin 5 of the RS232C/V.24 is brought low to stop the flow of data, and is brought high to restart it. Place DIP-Switch #2 in the UP position to enable Hardware Flow control (&E4).
PN 88300150 Switch #4 AS/400 Mode (Synchronous Mode/Leased Line/Dial-Up) The MT2834MR can function in an IBM AS/400 environment. Place DIP-Switch #4 in the DOWN position to cause the MT2834MR to operate via IBM command set. Place DIP-Switch #4 in the UP position to disable AS/400 mode Note: The MT2834MR must be in Command mode to allow AS/400 mode operation).
PN 88300150 Switch #6 Maximum Throughput Setting (Asynchronous Mode/Leased Line/Dial-Up) In some applications, you may want to dial into services with maximum throughput on. Other applications require maximum throughput off (e.g., service not supporting error correction, or the V.42 handshake interferes with logon sequence). Switch #6 controls three important parameters, which in effect enable or disable maximum throughput (error correction, speed conversion and serial port speed).
PN 88300150 Switch #10 Leased Line/Dial-Up Operation - “DDD” (Asynchronous/Synchronous Mode/Leased Line/Dial-Up) The MT2834MR can operate in both leased-line or dial-up modes. This switch controls leased-line/dial-up operation. For dial-up operation, place DIP-Switch #10 in the UP position. For leased-line operation, place DIP-Switch #10 in the DOWN position.
PN 88300150 7.3.2 DIP-Switches #13 - #16 Switches #13 and #14 - Speed Selection DIP-Switches #13 and #14 are used for speed selection (mainly in call origination leased line applications). 28800 bps Operation 19200 bps Operation 14400 bps Operation 9600 bps Operation DIP-Switch #13 #14 UP UP #13 #14 DOWN UP #13 #14 UP DOWN #13 #14 DOWN DOWN NOTE: The modem baud rate command, $MB, overrides the setting of DIP-Switches #13 - #14.
PN 88300150 For Modem A: ATEST/AV54 ATEST/AV54 Pin 25 Output (OOS) Pin 25 Input (Test Mode) (MT2834MR Default) (MT2834MRI Default) 7.4.2 BTEST/BV54 Jumper (S205) Jumper S205 sets pin 25 of Modem B as input (OOS) for the default and output (Test Mode) as the option setting on domestic (US) modems. On international modems, Jumper S205 sets pin 25 of Modem B as input (OOS) for the option, and output (Test Mode) as the default setting.
PN 88300150 8.1 Introduction This chapter starts out with statements about your modem’s 2-year warranty. The next section, Tech Support, should be read carefully if you have questions or problems with your modem. It includes the technical support telephone numbers, space for recording your modem information, and an explanation of how to send in your modem should you require service. The final sections explains ourweb presence. 8.2 Limited Warranty Multi-Tech Systems, Inc.
PN 88300150 8.4 Service In the event that repair service is required, you may send your modem to our Mounds View factory in the USA. Products requiring repair and are shipped to us from outside the USA must have a Returned Materials Authorization (RMA) and shipping instructions. To return products for repair from inside the USA, no RMA is required, simply send products to us freight prepaid.
PN 88300150 Appendix A ASCII/Hex/Decimal Conversion Chart CTRL CODE HEX DEC CODE HEX DEC CODE HEX DEC CODE HEX DEC @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] — NUL SOH STX ETX EOT ENQ ACK BEL BS HT LF VT FF CR SO SI DLE DC1 DC2 DC3 DC4 NAK SYN ETB CAN EM SUB ESC FS GS RS US NUL SOH STX ETX EOT ACK BEL BS HT VT ETB 4/3/01 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
PN 88300150 Appendix B Dial Pulse and Tone-Dial Frequencies DIAL PULSES B Closed A Open Digit 2 Digit 1 In the example above, the digit 2 is pulse dialed, followed by the digit 1. Each pulse consists of an A mSec. open and a B mSec. closed, where A will be either 60 or 67 mSec and B will be either 40 or 33 mSec., for a total of 100 mSec. per pulse, or a rate of 10 pulses per second. The interdigital pause time is 800 mSec. The pulse ratios are controlled by the &P command*.
PN 88300150 Appendix C DIP-Switch Summary DIP-Switch Condition Effect Asynchronous Mode #1 *UP Down DTR dependent on interface DTR force On at all times #2 *UP Down Hardware Flow Control Xon/Xoff Flow Control #3 UP *Down Disable Command Mode Response (dial up) Enable Command Mode Response (dial up) #3 UP *Down -10 dB Transmission (leased line) 0 dB Transmission (leased line) Note: dB transmission levels on International models may be different from those values shown above.
PN 88300150 DIP-Switch Condition Effect Synchronous Mode #1 *UP Down DTR Dependent On interface DTR forced On at all times #2 *UP Down SDLC Mode On BSC Mode On #3 UP *Down Disable Command Mode Response (dial up) Enable Command Mode Response (dial up) #3 UP *Down -15 dB Transmission (leased line) 0 dB Transmission (leased line) Note: dB transmission levels on International models may be different from those values shown above. Note: Switch #3 has no effect in leased line mode in the MT2834MRK.
PN 88300150 Appendix D Result Code Summary DIGIT WORDS EFFECT “Multi-Tech” Result Codes* 0 OK Command was executed without error; ready for next command. 1 CONNECT Modem has detected carrier and gone on-line. 2 RING Modem has detected ring caused by incoming call. 3 NO CARRIER No carrier signal has been detected within allowed time. 4 ERROR Error in Command line (too many, or invalid characters). 5 CONNECT 1200 Modem has detected carrier at 1200 bps and gone on-line.
PN 88300150 Note: If the MT2834MR used in LAP-M Reliable mode, the following Result Codes change: 1L CONNECT LAPM 5L CONNECT 1200 LAPM 9L CONNECT 2400 LAPM 10L CONNECT 4800 LAPM 12L CONNECT 9600 LAPM 13L CONNECT 14400 LAPM 19L CONNECT 19200 LAPM 21L CONNECT 21600 LAPM 24L CONNECT 24000 LAPM 26L CONNECT 26400 LAPM 28L CONNECT 28800 LAPM Note 1: If the MT2834MR is used with data compression, the word COMPRESSED or the letter C is added to the result codes.
PN 88300150 Appendix E S-Register Summary * indicates Values for MT2834MRK units only. REGISTER UNIT RANGE DEFAULT DESCRIPTION S0 1 ring 0-255 1 Sets number of rings until modem answers. S1 1 ring 0-255 0 Counts rings which have occurred. S2 ASCII 0-127 43 Sets Escape Code character (default is plus + sign). S3 ASCII 0-127 13 Sets character recognized as RETURN (default is CTRL-M). S4 ASCII 0-127 10 Sets character recognized as LINE FEED (default is CTRL-J).
PN 88300150 Appendix F Command Summary COMMAND VALUES DESCRIPTION AT Attention Code that precedes most command strings except A/, A: and Escape Codes. RETURN A Pressing RETURN key executes most commands. Answer call, even if no ring present. A/ Repeat last command. Do not precede this command with AT. Do not hit ENTER to execute. &A Answerback (proprietary feature) A:** Continuous redial (10 redials in DOC units) of last number until answered.
PN 88300150 $En n = 0 or 1 *** $E0 disables 300 baud error correction. $E1 enables 300 baud error correction. &En n = 0 thru 15 &E0 means V.42 Normal Mode. *** &E1 means V.42 Auto-reliable Mode. &E2 means V.42 Reliable Mode. &E3 means no modem-initiated flow control. *** &E4 means CTS modem-initiated flow control. &E5 means Xon/Xoff modem-initiated flow control. *** &E6 means Xon/Xoff not passed through. &E7 means Xon/Xoff passed through. *** &E8 means Enq/Ack pacing off. &E9 means Enq/Ack pacing on.
PN 88300150 &L4D selects 4 wire Originate mode operation &Mn n = 0 or 1 *** &M0 means Async when on-line. &M1 means Sync when on-line. $MIn** n = 0 or 1 *** $MI0 disables MI/MIC option (**) $MI1 enables MI/MIC option (**) $MBn n = speed $MB75 selects ITU-T V.23 mode. $MB300 selects 300 bps on-line. $MB1200 selects 1200 bps on-line. $MB2400 selects 2400 bps on-line. $MB4800 selects 4800 bps on-line. $MB9600 selects 9600 bps on-line. $MB14400 selects 14400 bps on-line.
PN 88300150 &SF1 selects DSR independent. $SPn n = 0 or 1 *** $SP0 disables UUCP Spoofing $SP1 enables UUCP Spoofing &Tn n = 4 or 5 &T4 means Enable Response to Request for Remote Digital Loopback. *** &T5 means Disable Response to Request for Remote Digital Loopback. #Tn n = 0 or 1 #T0 turns off Trellis Coded Modulation *** #T1 turns on Trellis Coded Modulation Un n = 0, 1, 2, or 3 Vn n = 0 or 1 V0 means Result Codes sent as (terse response).
PN 88300150 Appendix G V.25bis Operation Operation of your modem in ITU-T V.25bis mode provides you with an alternate set of commands and responses to those described in the AT Command Mode chapter of this manual. The V.25bis mode performs dialing functions in the asynchronous or synchronous mode according to the recommendations of the ITU-T (Consultative Committee of International Telephony and Telegraphy). Synchronous mode, which is the more common use of V.
PN 88300150 Another asynchronous mode issue is connecting at a different speed than the speed at which the serial port is set. If your modem port speed is different from the serial port speed, you must either: 1. Enable speed conversion and have flow control on, or 2. Enable connect responses (with the ATX1 command) and change the serial baud rate after receiving a connect message. DTR dialing is functional in V.25bis mode, except the number dialed is from the V.25bis mm memory location 01.
PN 88300150 V.25bis Mode AT Commands The following commands either alter standard V.25bis behavior (so you must be careful in their use) or they are not allowed, as indicated. All other commands can be used in V.25bis operation. A Not Allowed A/ Not Allowed A: Not Allowed D Not Allowed D...N Not Allowed $D Alters Operation ($D1 in V25bis is direct call mode) E Alters Operation &F Alters Operation (removes modem from asynchronous V.25bis mode) N Not Allowed N...
PN 88300150 LSDmm;dd...dd Phone number on the Delay list LSFmm;dd...dd Phone number on the forbidden list CON ssss Connection at ssss speed (if X1 in effect) V.25bis AT Commands The AT commands associated with V.25bis mode are described as follows. Note that one command enables and disables V.25bis mode and the rest are only operable in the V.25bis mode. Enable/Disable V.25bis Mode ($V) Command The function of the $V command is to select the V.25bis mode in asynchronous mode.
PN 88300150 Dial Phone Number Stored in Memory (CRS) Command A telephone number that you have stored in the modem’s memory may be automatically dialed after checking it against the Delayed and Forbidden number lists by entering CRSmm where mm = 01, 02, 03, 04,....20. For example, a number stored in mm location 15 is entered CRS15 and hitting ENTER, then, if the number in mm memory location 15 is not on either list, it is automatically dialed.
PN 88300150 connected via pin 20 of the RS232 interface. In DTR Dialing, the modem dials a stored number as soon as it receives a high DTR signal. The DTR Dialing method is popular when using the modem in synchronous applications. To activate DTR Dialing, type the command AT$D1 and hit ENTER. The modem now dials the phone number stored as N0 when it receives a high DTR signal (see the D...N command in Chapter 4). DTR must remain high for the duration of the call, until disconnect.
PN 88300150 2. Switzerland a) Command/Indication modification 1. Modem must remain on-hook for 5 seconds after disconnect 2. Modem must remain on-hook for 5 minutes after consecutive failed calls 3. If modem must remain on-hook, then it is “paused” 4. If the modem is paused and a call is attempted a PAU indication is given. a) PAUt Modem is paused for t minutes b) Delayed and Forbidden list behavior 1. 2 minute delay between 4 retries 2. After 4 retries the number is put on the forbidden list 3.
PN 88300150 5. Belgium a) Command/Indication modification (none) b) Delay and Forbidden list behavior 1. 1 min. delay between calls 2. After 4 retries, the number is put on the forbidden list 3. The number remains on the forbidden list for 1 hour after entry to forbidden list 4. Delayed and Forbidden Numbers lists are checked when dialing in AT command mode. If dialing is not possible then No Carrier is the response. c) Auto-Answer behavior 1. Auto-Answer in 5 seconds if no DIC. 6.
PN 88300150 Appendix H RS232C Interface Specifications The MT2834MR’s RS232C interface circuits have been designed to meet the electrical specifications given in EIA (Electronic Industries Association) RS232C standards. All signals generated by the modem are approximately 10 volts when measured across a load of 3000 ohms or greater. The receiving circuits of the modem accepts signals in the 3 to 25 volt range.
PN 88300150 FUNCTIONAL DESCRIPTION OF MT2834MR RS232C SIGNALS: Transmitted Data - Pin 2, SD (BA) Direction: to modem Signals on this circuit are generated by the customer’s terminal and transferred to the transmitter of the MT2834MR. A positive signal is a space (binary 0) and a negative signal is a mark (binary 0). The transmitting terminal should hold this line in the marking state when no data is being transmitted, including intervals between characters or words.
PN 88300150 Transmit Clock - Pin 15, TC (DB) Direction: from modem The TC signal is provided only when the MT2834MR is used in the synchronous mode. The clock is a square wave and is used to provide the computer or terminal with timing information for its Transmit Data circuit (pin 2). This clock is provided on the interface at all times when the modem is in synchronous mode.
PN 88300150 Appendix I Cable and Connector Pin Diagrams RS232 Cable 1 2 3 4 5 6 7 8 9 12 15 17 20 22 25 1 2 3 4 5 6 7 8 9 12 15 17 20 22 25 Frame Ground Transmit Data Receive Data Request to Send Clear to Send Data Set Ready Signal Ground Carrier Detect + Voltage Test High Speed Transmit Clock Receive Clock Data Terminal Ready Ring Indicator Terminal Busy 1 2 3 4 5 6 7 8 9 12 15 17 20 22 25 25-pin Male Connector (DB25P type) 25-pin Female Connector (DB25S type) (on back of modem or CC216 rack) Connect
PN 88300150 APPENDIX J MULTI-TECH SYSTEMS’ ESCAPE METHODS Introduction You may find it necessary sometimes to issue AT commands to your modem while you are on-line with a remote modem, without disconnecting the call. If so, you will want to take advantage of Escape methods which allow you to change the modem’s mode of operation from On-Line mode to Command mode, where you may issue AT commands, without disconnecting.
PN 88300150 Escape Method 1: +++AT In the following example, a user who is On-Line decides to set S0 Register to 1, to configure the modem to answer on the first ring. 1. The user enters the sequence +++AT . The sequence is sent to the modem. 2. The modem transmits the +++. 3. The modem buffers AT and starts the Wait for timer. 4. Upon receiving the the modem escapes to Command mode. 5. The modem responds OK. 6. The user enters the command ATS0=1.
PN 88300150 Aborting an Escape Sequence The +++AT escape will abort if you do not issue a before the Wait for Time interval expires. The AT method will also abort if you do not issue a before the Wait for Time interval expires, and also if any of the following occurs: 1. An illegal sequence is detected, including: a) A character other than A follows the ; b) A character other than T follows A; c) Two BREAKS are received in succession; 2.
PN 88300150 APPENDIX K Remote Configuration Introduction This chapter describes how the MT2834MR Remote Configuration feature operates. This feature uses a multilevel security system that involves the use of LOGIN passwords, SETUP passwords, and remote escape characters. The primary level security code is the modem’s LOGIN password. Once this password is entered, other passwords can be used. For instance, entering the LOGIN password lets you enter the SETUP password.
PN 88300150 To change your modem’s LOGIN and SETUP passwords, follow the steps below. NOTE:Passwords are upper/lower case sensitive. The case you enter here is the case that must be used at login. Modem LOGIN, SETUP, and Remote Escape Codes 1. Type AT#IMULTI-TECH and press ENTER. Your modem responds with: OK (if the LOGIN password is wrong, the modem’s response is ERROR) 2. Type AT#SMODEMSETUP and press ENTER.
PN 88300150 Remote Configuration Procedures This section explains how to use the Remote Configuration feature; they are the same whether or not a call originates from the remote modem. Remote Configuration Operation 1. Enter a break signal, then type the S13 remote configuation escape character three times (the default S13 value is the "%" sign). The modem responds with: 1. - DATA Mode 2. - COMMAND Mode 2. Select 1 or 2.
PN 88300150 Appendix L MT2834MRI PC Board MT2834MRI PCB Top 4/3/01 104
PN 88300150 MT2834MRI PCB (Chassis 2) 4/3/01 105
PN 88300150 MT2834MRI Labels 4/3/01 106
