Industrial Modem User Guide
Modem Features
Power Down Feature
S119 can be set with the number of seconds of no activity before the modem shuts down. The modem will not shut down if DTR is asserted, if the modem is connected, any key on the keyboard is pressed or an alarm switch is on.
The modem will wake up if:
·DTR is raised
·there is a Ringing signal or
·an alarm switch is asserted. S119 defaults to 0 (power down disabled).
The modem draws almost no power when powered down.
Dial and Talk Feature
This feature enables a modem to alert, by spoken word, that an alarm situation at a remote site needs attention. The modems can be configured to dial up to 10 preset numbers and speak a stored message when one of two external switches are closed.
These switches will connect to pins 12 and 7 (alarm 1) and pins 13 and 7 (alarm2) of the RS232 connector. An alarm condition is recognised when a short circuit is applied across either pair of pins, eg by use of a relay.
By default to modem will ring stored number 0 if either alarm switch is closed.
To set stored number 0 type:
AT&Z0 = nnnnnnnnnn where nnnnnnnn is the phone number.
You may store up to 10 numbers using &Z0 to &Z9.
The numbers to ring for each alarm can be specified by the AT#ALM command:
AT#ALM1=1,4,8,3
Means than if alarm switch 1 is pressed the modem should ring the stored numbers 1 then 4 then 8 then 3.
AT#ALM2= 9
Means that if alarm switch 2 is pressed dial stored number 9.
YML3913A | 8 |
