Rockwell Automation 9323-PA1E USER MANUAL APS 6.0 - Manual (Page 210)

Preface
Advanced Programming Software User Manual
11–16
[F6] Modem Initialize String
You should verify in your modem user manual that all of the commands in the
modem initialize string are supported. All unsupported commands should be
deleted from the initialize string, or your modem may not function properly.
Pay particular attention to commands beginning with “&”. If your modem does not
support these AT commands, there will be either a dip switch or a set of jumper
switches on the modem that will have to be checked to make certain that the
hardware handshaking is configured properly.
Default Initialize String – AT L1 &M &C1 &D2 &S1 &W DT where:
AT Gets the modem’s attention.
L1 Sets speaker volume low (2 = medium, 3 = high).
&M Sets communication mode to asynchronous.
&C1 DCD set by modem when remote carrier is detected.
&D2 Switches to command mode when DTR goes off. Also hangs up.
&S1 Causes DSR to operate in accordance with EIA RS-232C specification.
&W Writes new settings to non-volatile RAM and causes preceding commands
to take effect.
DT Specifies tone dialing.
Other commonly used commands:
M0 Shuts off modem speaker.
DP Specifies pulse dialing.