LED Function
CD This LED indicates the presence of a carrier signal. It should stay on as long as
there is an active connection to the modem.
TXD This LED flashes to indicate the presence signals transmitted out on the telephone
line.
The two LEDs indicating traffic on COMM 1 are marked RXD and TXD.
LED Function
RXD This LED flashes as signals are received on Comm1 from the RS-485
loop.
TXD This LED flashes as signals are transmitted from Comm1 to the RS-485
loop.
Modem Initialization String Examples
The modem supports various commands in the initialization string. The
examples below are for use when the modem is used to receive incoming
calls.
1. Enter the following string to force the modem to use the 1200 bps Bell
212A quick-connect (this ensures the modem will answer incoming calls
and connect within nine seconds):
AT&F0 +MS=69,0,1200,1200 \N0 S0=1
2. This string will set the modem back to its default state of connecting
with the fastest possible baud rate between modems:
AT&F0 S0=1
For any initialization string it is recommended that the &F0 be at the
beginning of the string. A list of compatible AT commands is provided in
Chapter 5: ”Technical Reference”.