Omron SYSMAC CS1W-SCB41-V1 Operation Manual page 632

K3T @ Intelligent Signal Processor Protocol
• RS-485 2-wire Connections
Serial Communications
Board/Unit
Signal
Name
*1: Set the 2-/4-wire switch
to the 2-wire setting.
*2: Turn ON the terminat-
ing resistance switch.
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 Boards/Units can be connected.
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:
Pin
Terminal block
No.
Signal
Termi-
FG
Name
nal.
1
SDA
19
2
SDB
18
Shield
Shield
Abbreviation
–
+
SN751177N or
equivalent
5 V
51 kΩ
Terminal
block SW
220 Ω
4.7 kΩ
4.7 kΩ
6.8 V
4.7 kΩ
Intelligent Signal Processor
Unit designated as terminator.
RS-485:
Terminal block
Signal
Termi- Terminal block SW ON
220 Ω
Name
nal.
18
19
The terminal block switch is turned ON.
Appendix L
Signal direction Terminal
Input or output 19
Input or output 18
TX
RX
603