Communication
9.1Controller with RS-232-C port
The system bus connection is located at the back of the controller housing
In this case, the controller can be connected either directly to the serial interface of a PC
No communication, but the modem is ready
Interval between dialing has not yet elapsed since the last attempt Connection currently established
Incoming call Modem is initialized
(appears only briefly, if it appears for longer period, the modem has not responded with” OK“ and ATZ
Controller dialing control Connection is cut
Additionally, the building control station can dial the controller, poll it and send it new data af- ter writing to the holding register no. 92 with valid key number.
The Alternative recipient function is used by the controller after a programmable number of di- aling attempts to the building control station has been completed.
Note!
If a wrong key number has been written to holding register no. 92 for the third consecutive time, the controller immediately interrupts the modem connection and generates an alarm (Unautho- rized access occurred). As a result, the call to the configured control system is triggered. Bit D15 is deleted as soon as the error status register has been read by the control system and the con- nection has been terminated.
In special cases, the Lock
EB 5476 EN 67