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Communication
Fig. 27 · Pin assignment RS-232-C and RS-485
9.1
RS-232-C serial interface
The system bus connection is located on the back of the controller casing (RJ12 jack).
A controller can either be directly connected to a serial PC interface (point-to-point connec-
tion) or to dial-up modem. In the case, the controller is connected to the telecommunications
network, a dial-up modem is required. The controller works autonomously and can trigger a
call to the building control station in case of a fault.
When the modem function is active, a call to the control station is triggered as soon as the
status of the status register (FSR) changes. After communication has been established with the
control station and it has read the FSR, the function in the controller to trigger a call is reset.
In the case when the control station does not respond to the station address, connection is
cancelled by the controller after the time Modem-timeout to has elapsed. If the connection to
the control station is disrupted, the alternative number is dialed after the controller has at-
tempted to redial the control station unsuccessfully by number of times set under An .
In special cases, the Blocking modem dialing function can be selected to prevent a call being
made when a fault occurs. The building control station can also be informed when a previ-
ously reported fault no longer exists with the Dialing also when fault no longer exists func-
tion.
Functions
Modem operation
80
EB 5477 EN
GNDTD DTR DCD RD RTS
RS 232
WE
OFF
30 min
5 min
5 min
PULS
–
T
T
A
B
RS 485
Configuration
Fb44 = ON
8 bit/16 bit addressing
Cyclic initialization In * / 0 to 255 min
Modem dialing interval PA * / 0 to 255 min
Modem timeout to * / 0 to 99 min
Dialing procedure / PULS, ton
Phone number GLT *
R
R
B
A
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