Westermo TR-36 User Manual

Page 27

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6614-2202

… 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