602
K3T
@
Intelligent Signal Processor Protocol Appendix L
RS-422/485 Connections
• RS-422 4-wire Connections
Signal name Abbreviation Signal direction Pin No.
Send data A SDA Output 9
Send data B SDB Output 5
Receive data A RDA Output 6
Receive data B RDB Input 1
Signal ground SG --- 3
Protective ground FG --- 7
Up to 32 units can be connected
RS-422/485 port
K3T#
K3T#
K3T#
Serial Communications Board
(CS Series only)
Serial Communications Unit
(CS/CJ Series)
PLC
PS
RS-422/485
RS-422/485
RS-422/485
Serial Communications
Board/Unit
Shield
Signal
Name
Pin
No.
Terminating resistance (approx. 220 Ω) is
connected via the terminal block switch.
Terminal block SW
SN751177N or
equivalent
Signal
Name
Intelligent Sig-
nal Processor
Te r mi -
nal.
RS-422: D-sub
9-pin female
Hood
*1: Set the 2-/4-wire switch
to the 4-wire setting.
*2: Turn ON the terminat-
ing resistance switch.
FG
RDA
RDB
SDA
SDB
6
8
1
2
SDA
9
5
6
1
3
SDB
RDA
RDB
SG
220 Ω
220 Ω
6.8 V
RS-422:
Terminal block
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