Westermo TD-36 - Manual (Page 31)

31 6618-2202
Application examples
… TD-36 connected to TD-36 with DTR signal call
Configure the units
Set up the connection – The dialling modem
ATA Enter the answer command when RING comes from the network or set up
ATS0=1 to auto answer on 1 RING signal (or more than 1)
Set up the connection – The answering modem
PSTN
Network
NOTE: If no valid DTR signal can be provided by external application, the modems DSR signal can
be used to trig the transmission. Connect the DSR signal via a relay, or other potential
free contact, to the DTR signal. A 10 kohm pull down resistor should also be connected
between the DTR and a signal that is always low e.g. the DCD.
DTR
DSR
DCD
Relay
External
application
10 kohm
May be required in harsh environments.
AT&F Set the unit to factory default
AT&W Store default settings
AT&Z0=nnn Store the number of the remote modem in the dialling TD-36
AT&S0 Set DSR signal always high (if this signal is used to trig the DTR)
AT&B1 Activates automatic DTR dialling if DTR switches from low (OFF)
to high (ON)
AT&W Save settings
Switch DTR from
OFF to ON The modem will now dial the phone number stored in the first location of
the telephone number table (AT&Z0=<nnn>)