Modem Initialization Settings

AlarmTraq recommends the use of at least 2 external serial modems (MT5634-ZBA). Having 2 serial ports onboard will save you the cost of an additional ISI board.

Recommended Platform:

MultiTech ISI Multiport Serial Card or Comtrol RocketPort
MultiTech MultiModem ZBA Serial Modems (QTY 8)

MultiTech
MultiTech MultiModem ZBA AT Commands
Reference Guide +V Commands for Modems
MultiTech Support  
US Robotics
5686 External USR5686 56K V.92 Faxmodem
USR5633A USR

USR5633A 56K USB Faxmodem

Switch Settings
 

MultiTech MT5634ZBA Modem

The MultiTech MT5634ZBA external modem is recommended for AlarmTraq. For instructions on how to physically connect it and for general configuration instructions, see the documentation that came with the modem.

Set the modem initialization string to:

Using Caller ID ATS0=2+VCID=1
Without Caller IDATS0=1


U.S. Robotics

For instructions on how to physically connect it and for general configuration instructions, see the documentation that came with the modem.

Set the DIP switches on the modem to match the settings listed in the table below.

U.S. Robotics External Modem Switch Settings Switch Setting Function

  1. OFF (Up) DTR (Data Terminal Ready) override
  2. OFF (Up) Result codes
  3. ON (Down) Result codes
  4. OFF (Up) Keyboard command echo
  5. ON (Down) Auto answer
  6. OFF (Up) CD (Carrier Detect) override
  7. ON (Down) Power-on and ATZ reset factory defaults
  8. ON (Down) AT command recognition

Initialization Strings: When using a US Robotics modem, I have found the best initialization strings are:

Using Caller IDAT&F1&N6S0=2#CID=1
Without Caller IDAT&F1&N6S0=1
Error Correction Disabled*AT&F1&M0&K0&N6S0=1
If you need to connect to older systems using TN1648 boards (2400 baud) you need to turn off error control (ARQ) by adding &M0 to the string like: AT&F1&N6&M0&K0S0=1

Other Modems
AT&N6S0=2#CID=1(U.S.Robotics, Texas Instruments, Rockwell compatible modems)
ATS0=2+VCID=1(Comtrol RocketModem III, IS-101 modems, Lucent LT, MultiTech, IDC, Cirrus Logic...)
ATS37=9S0=2+VCID=1(Comtrol RocketModem III, IS-101 modems, Lucent LT, MultiTech, IDC, Cirrus Logic...) 9600 baud
AT#CC1(Aspen modems, Cirrus Logic, Motorola Voice Surfer, Phoebe)
AT*ID1(Motorola)
AT%CCID=1(Practical Peripherals)