Samson TROVIS 5571 Mounting And Operating Instructions page 19

Fig. 2 · Pin assignment, RJ-12 system bus interface
Modbus slave interface RS-232
The Modbus connection is located on the rear panel of the controller housing (RJ 12 jack). The
controller can be connected either directly to the serial interface of a PC (point-to-point connec-
tion) or to a (dial-up) modem. A dial-up modem is required if the controller is to be connected to
the telecommunications network. In this case, the controller operates autonomously and issues
an alarm to the building control station (GLT) when faults occur. In addition, the building control
station can dial up to the controller and read data from it.
Parameters*
Station address
16-bit addressing?
Control system
monitoring
Modem
Cyclical initialization
Automatic disconnection
Baud rate
* –> Section 5.3 (Description of communication parameters to be adjusted)
GND TD DTR
WE Settings level / Range of values
255 RS-232/Slave > Modbus Slave / 1 to 247, 255
No RS-232/Slave > Modbus Slave > Station address / Yes, No
30 min
RS-232/Slave > Modbus Slave / 1 to 300 min
Off RS-232/Slave
Modem = On: PLC connected to telecommunications network
Modem = Off: PLC directly connected to a computer
30 min RS-232/Slave > Modem = On / 1 to 300 min
5 min RS-232/Slave > Modem = On / 1 to 300 min
9600 RS-232/Slave / 9600, 19200
DCD RD RTS
Communication
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EB 5571 EN