Omron CJ - 09-2009 Operation Manual page 714

CJ1W-CIF11 RS-422A Converter
RS-422A/485 Terminal Block
Block Diagram
SD
RS
CS
RD
ER
DR
+5 V
SG (0 V)
FG
DIP Switch Settings
Pin
number
1 Terminating resistance
2 Two-wire/four-wire method selec-
tion (See note 1.)
3 Two-wire/four-wire method selec-
tion (See note 1.)
4 Not used.
5 Selection of RS control for RD
(See note 2.)
6 Selection of RS control for SD
(See note 3.)
Note 1. Set pins 2 and 3 to the same setting. (ON for the two-wire method or OFF for the four-wire method.)
2. To prohibit echoback, set pin 5 to ON (with RS control).
3. When connecting to several devices using the four-wire method in a 1:N connection, set pin 6 to ON
(with RS control). When connecting using the two-wire method, set pin 6 to ON (with RS control).
666
Signal
RDA–
RDB+
SDA–
SDB+
FG
SW.6
SW.3
SW.5
Function
With (at both ends of the commu-
nications path)
Two-wire method
Two-wire method
---
With RS control
With RS control
SDB(+)
SDA( -)
SW.2 SW.1
RDB(+)
RDA(-)
FG
ON
Appendix G
OFF
Without
Four-wire method
Four-wire method
---
Without RS control (always ready
to receive)
Without RS control (always ready
to send)