Appendices
CJ1W-CIF11 RS-422A Converter
The CJ1W-CIF11 RS-422A Converter is used to convert RS-232C to RS-422A/485.
It is connected directly to the RS-232C port on a CJ2 CPU Unit.
It is not isolated, so the maximum distance for RS-422A/485 is 50 m.
Appearance
Electric Specifications
• RS-422A/485 Terminal Block
RDA−
RDB+
SDA−
RDA−
RDB+ SDA− SDB+ FG
• RS-232C Connector
RS-232C port
+5V 6
−7
−8
SG (0 V) 9
* The hood will have the same electric potential as the connector hood where it is connected.
DIP Switch Settings
Pin No.
1
Terminating resistance set-
ting
2
2-wire/4-wire setting
3
2-wire/4-wire setting
4
Not used.
5
RS control selection for RD
6
RS control selection for SD
*1 Set both pins 2 and 3 to either ON (2-wire) or OFF (4-wire).
*2 To disable the echo-back function, set pin 5 to ON (RS control enabled).
*3 When connecting to a device on the N side in a 1: N connection with the 4-wire method, set pin 6 to ON (RS
control enabled).
Also, when connecting by the 2-wire method, set pin 6 to ON (RS control enabled).
A-114
Signal name
RDA−
RDB+
SDA−
SDB+
FG
SDB+
FG
Connector pin
Pin No.
arrangement
1
FG
1 FG
2
RD
2 RD
3 SD
3
SD
4 CS
4
CS
5 RS
5
RS
6
+5 V
7, 8
NC
9
SG (0 V)
Hood
NC*
Setting
Connects terminating resistance on
both ends of the transmission path.
*1
2-wire
*1
2-wire
---
*2
RS control enabled
*3
RS control enabled
Signal
name
ON
OFF
Disconnects terminating
resistance.
4-wire
4-wire
---
RS control disabled (Data
always received.)
RS control disabled (Data
always sent.)
CJ2 CPU Unit Hardware User's Manual