TTK FG-SYS - Page 34

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3.2. Electrical connexions:
3.2.1 RS232 For One Single FG-SYS Digital Unit (max 100m):
PC serial port 1 FG-SYS Digital Unit
DB9 RS232
2 (Rx) Tx
3 (Tx) Rx
5 (GND) GND
RS232 cable
3.2.2 RS422 For Several FG-SYS Digital Units (max 1200m):
PC serial port 1 RS232/RS422 Converter FG-SYS Unit N°1 FG-SYS Unit N°2 ...
DB9 DB25 RS422 interface RS422/485 terminal RS422/485 terminal
2 2 T- R- R-
3 3 T+ R+ R+
5 7 R- T- T-
R+ T+ T+
RS232 cable RS422 cable RS422 cable To the
following FG-SYS Digital Units
3.2.3 RS485 for multiple FG-SYS digital units (1200 m max):
The RS485 interface is obtained via the RS422 interface
Connect Rx- and Tx- together to obtain RT- (or Data-, or A), and connect Rx+ and Tx+ together to
obtain RT+ (or Data+, or B)
PC serial port 1 RS232/RS485 adapter FG-SYS 1 FG-SYS 2 ...
DB9 DB25 RS485 interface RS422/485 terminal block RS422/485 terminal block
2 2 RT- R- R-
3 3 RT+ R+ R+
5 7 T- T-
T+ T+
RS232 cable RS485 cable RS485 cable