Communication
GND TD DTR DCD RD RTS
Fig. 8 · Pin assignment of
9.1RS-232-C system bus interface
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
On recognizing the key code from the controller as valid, the register value “1” confirms writing permission. In any other case, the register value remains at “0”. Any further establishment of communications requires the writing permission to be acquired by resending the key number.
Note!
If a wrong key number has been written to holding register no. 40070 for the third consecutive time, the controller immediately interrupts the modem connection and sets the D6 bit of the error status register (Unauthorized access). As a result, the call to the configured control system is triggered or a text message/fax is sent. Bit D6 is deleted as soon as the error status register has been read by the control system and the connection has been terminated.
In special cases, the Lock
EB 5179 EN 77