User's Manual

455U-D Radio Modem Module User Manual
Page 50 © Jan 2008
Response from 455U-D OK
Save configuration AT&W
Exit command mode ATO
Note that some commands will automatically exit command mode. Several commands can be
run together, for example, ATB2&WO is the same as ATB2 and AT&W and ATO
Prior to Configuration
Before configuring a module initially, force the module to its factory default configuration -
either by using the DIP switch (refer section 3.10), or by using the AT&F command. If you
are making a change to an existing configuration, this step is not necessary.
Appendix A details all of the Hayes commands accepted by the 455U-D. The following
commands are the most common.
3.13 AT Configuration Examples
The following section describes some typical applications and the configuration of the
modems involved.
Data Logger Network with Central Computer
In this application, the computer connects to each logger on a regular basis, and uploads
information from the logger. The logger protocol does not support error checking, and the PC
application software is designed to work with telephone modems. The PC software issues
ATD commands to the central modem to make connection with each logger. When it has
finished communicating with the logger, it issues an ATH command to terminate the
connection.
Central Modem configuration
AT&M1 – Configure Acknowledged Mode
AT&E1 – Enable Error checking
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.
Unacknowledged mode with broadcast messages and repeaters.
This example demonstrates how to broadcast messages to the entire system using
unacknowledged mode.