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Appendix 5 Connecting for RS485 communication
Connector diagram for 2-wire RS485 communication
Connecting diagram for 2-wire RS485 communication
* Never use pin-7 (P11).
Master
RXD+/TXD+
RXD-/TXD-
SG
C
N1
Pin-4
Pin-5
Pin-8
(Pin-3)
Straight Straight
Terminating resistance
120 -1/2W
Straight
Slave
RXD+/TXD+
RXD-/TXD-
SG
Slave
RXD+/TXD+
RXD-/TXD-
SG
Slave
RXD+/TXD+
RXD-/TXD-
SG
Signal name Pin number Description
RXD+/TXD+ 4 Same phase reception data (positive line)
RXD-/TXD- 5 Anti-phase reception data (negative line)
FWE 6 FEW (Do not connect the cable.)
SG 8
(3)
Ground line of signal data
PRG(TX) 2 PRG (Do not connect the cable.)
PRG(RX) 1 PRG (Do not connect the cable.)
P11 7 11V (Do not connect the cable.)
Pin-1Pin-8