Omron GRT1-ML2 Hardware Reference Manual page 67

Hardware reference
Serial connector
The serial connector allows for three communication standards:
• RS232.
• RS422.
• RS485.
/i
Pin Communication
1 RS422/RS485
2 RS232
3 RS232
4 N/C
5 N/C
6 RS422/RS485
7 RS422/RS485
8 RS422/RS485
9 RS232
TERM ON/OFF Switch
Sets the termination on/off of the RS422 / 485 serial connection. The setting
of the TERM ON/OFF switch depends on the communication standard of the
serial connection and the position of the TJ1-MC__ in the network:
/i
Communication Position of the TJ1-MC__
standard
RS422 or RS485 First or last
RS422 or RS485 Not the first and not the last
HARDWARE REFERENCE MANUAL
Connection
/Tx
Tx
Rx
N/C
N/C
/Rx
Tx
Rx
0 V
Setting of the TERM ON/OFF
switch
Left (on)
Right (off)
fig. 22
5
9
4
8
3
7
2
6
1
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