Application Examples - Westermo TD-36 User Manual

Application examples
... T D-36 connected to TD-36 with DTR signal call
Configure the units
AT&F
AT&W
Set up the connection – The dialling modem
AT&Z0=nnn
AT&S0
AT&B1
AT&W
Switch DTR from
OFF to ON
Set up the connection – The answering modem
ATA
NOTE: I f 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.
6618-2202
Set the unit to factory default
Store default settings
Store the number of the remote modem in the dialling TD-36
Set DSR signal always high (if this signal is used to trig the DTR)
Activates automatic DTR dialling if DTR switches from low (OFF)
to high (ON)
Save settings
The modem will now dial the phone number stored in the first location of
the telephone number table (AT&Z0=<nnn>)
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)
DTR
DSR
10 kohm
DCD
May be required in harsh environments.
PSTN
Network
Relay
External
application
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