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
WE
Configuration
Modem operation
OFF
30 min
5 min
5 min
PULS
–
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
*
80
EB 5477 EN
Communication
RS 232
RS 485
GNDTD DTR DCD RD RTS
T
A
T
B
R
B
R
A
Fig. 27 · Pin assignment RS-232-C and RS-485