Samson TROVIS 5571, Mounting And Operating Instructions

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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 *
WE Settings level / Range of values
Station address
16-bit addressing?
Control system
monitoring 255
No
30 min RS-232/Slave > Modbus Slave / 1 to 247, 255
RS-232/Slave > Modbus Slave > Station address / Yes, No
RS-232/Slave > Modbus Slave / 1 to 300 min
Modem Off RS-232/Slave
Modem = On: PLC connected to telecommunications network
Modem = Off: PLC directly connected to a computer
Cyclical initialization 30 min RS-232/Slave > Modem = On / 1 to 300 min
Automatic disconnection 5 min RS-232/Slave > Modem = On / 1 to 300 min
Baud rate 9600 RS-232/Slave / 9600, 19200
* –> Section 5.3 (Description of communication parameters to be adjusted)
EB 5571 EN
19
Communication
GND TD DTR RTS RD DCD
Fig. 2 · Pin assignment, RJ-12 system bus interface