358
K3T
#
Intelligent Signal Processor Protocol
Appendix I
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)
PC 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
Termi-
nal.
RS-422: D-sub
9-pin female
RS-422:
Terminal block
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
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