Modem 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 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 ID |
ATS0=1 |
|
MT2834ZBA AT Commands
MT5634ZPX AT Commands
MT5656ZDX AT Commands
Reference Guide
MultiTech Support
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
- OFF (Up) DTR (Data Terminal Ready) override
- OFF (Up) Result codes
- ON (Down) Result codes
- OFF (Up) Keyboard command echo
- ON (Down) Auto answer
- OFF (Up) CD (Carrier Detect) override
- ON (Down) Power-on and ATZ reset factory defaults
- ON (Down) AT command recognition
Initialization Strings:
When using a US Robotics modem, I
have found the best initialization strings are:
|
Using Caller ID |
AT&F1&N6S0=2#CID=1
|
|
|
Without Caller ID |
AT&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
|
|
Links:
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) |