… TR-36 – Secure Call-back
The TR-36 is connected to a PLC which one want to restrict access to. The TR-36 can
support access control through the Secure Callback function. In this example password
and callback to a predefined number is chosen. The modem in the calling end is here
chosen to be a PSTN modem, but can be any of the PSTN, ISDN or GSM modem from
Westermo product range.
The DTE serial speed between the PLC – TR-36 and TDW-33 – PC is assumed to be
9600 8N1 but can be chosen to fit the actual system requirement.
Configure the TR-36
AT&F Set the unit to factory default
AT+IPR=9600 DTE baudrate 9600
AT+ICF=3,4 Character framing 8 data, 1 stop, parity
none
ATS0=1 Auto answer after first ring
ATQ1E0&C1&K0&A1 Suitable for PLC communication
AT&W Save settings
AT*WCB=4 Callback enabled, Password in one or more
positions in *wcbpwdx (x= 1,2 or 3), call-
back to number in wcbtab
(*wcbpwd1 corresponds to *wcbtab1. . .)
AT*WCBTAB=1,”+4670428000”,”n3Y9kA6otYZu8” Define callback number and password
in position 1.
When the password is entered number
+4670428000 will be called.
AT*WCBTIME=10 Define delay time between hangup
an callback.
The TR-36 will wait 10 s after hangup to
callback to allow the analogue modem to
hangup.
Configure the TDW-33
AT&F Set the unit to factory default
AT+IPR=9600 DTE baudrate 9600
AT+ICF=3,4 Character framing 8 data, 1 stop, parity
none
ATS0=1 Auto answer after first ring
AT&W Store default settings
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