Omron CQM1H-SCB41 Operation Manual page 304

K3T@ Intelligent Signal Processor Protocol
• RS-485
Serial Communications
Board
Note 1. The connection configuration is a one-to-one or a 1-to-N configuration. For 1-to-N connections, up to
32 units including the Serial Communications Board can be connected using a 2-wire connection. Us-
ing a 4-wire connection, up to 32 units can be connected with only the K3T@.
2. The maximum cable length is 500 m. Use shielded twisted-pair cables (AWG28i or greater).
3. Connect terminating resistance at both ends of the transmission path.
4. Turn the terminal block switch ON at the terminators.
5. Turn the terminal block switches OFF for units that are not terminators.
Signal name
Inverting output
Non-inverting output
Intelligent Signal Processor
Turn ON the terminal block switch for
terminators only.
RS-485: D-sub
9-pin female
RS-485:
Signal Pin
Terminal block
Name
No.
Termi-
nal.
Shielded cable
Shielded cable
Abbreviation
– Input or output
+ Input or output
Terminal
block SW
Signal
Name
Intelligent Signal Processor
Unit designated as terminator.
RS-485:
Terminal block
Termi- Signal
Terminal block SW ON
nal. Name
The terminal block switch is turned ON.
Appendix I
Signal direction Terminal
19
18
SN751177N or
equivalent
289