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Appendix I
K3Tj Intelligent Signal Processor Protocol
286
RS-422A/485 Connections
Up to 32 units can be connected
Serial Communica-
tions Board
RS-422A/485 port
K3Tj
K3Tj
K3Tj
CQM1H
• RS-422A
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
Serial Communications
Board
Shielded
cable
Terminating
resistance
Signal
Name
Pin
No.
Terminating
resistance
(terminator)
Terminating resistance (approx. 220 Ω) is
connected via the terminal block switch.
Terminal block SW
SN751177N or
equivalent
Signal
Name
Pin
No.
Intelligent Sig-
nal Processor
Termi-
nal
.
RS-422A: D-sub
9-pin female
RS-422A:
Terminal block