Block Diagram - Omron NT631 Operation Manuals

Using an RS-232C/RS-422A Convertor Unit
RS-232C Connector
Connector
pin No.
1
1
6
2
2
7
3
3
8
4
4
9
5
5
6
7
8
9
* The hood is connected to the functional ground terminal of the RS-422A terminal block.

Block Diagram

A diagram showing the internal blocks of the convertor unit is shown below. Refer to this diagram when making
cables yourself, or when connecting devices with special interfaces.
RS-232C side
D-SUB 9P CASE
Fuse
6
+5 V
9
SG
3
RD
2
SD
4
RS
5
CS
7
DR
8
ER
650
Signal name
Not used
Send data
Receive data
Request to send
(shorted to CS internally)
Clear to send
(shorted to RS internally)
+5 V (150 mA) input for convertor unit
Data set ready
(shorted to ER internally)
Data terminal ready
(shorted to DR internally)
Signal ground
POWER
LED
R
Photocoupler
RS-232C
Dr/Rec
R
Abbreviation
–
SD
RD
RS
CS
+5 V
DR
ER
SG
RS-422A/485 Dr/Rec
Convertor
DC-DC
IS_5 V
L L REG
IS_0 V
R R R
SW1-6
SW1-5
Terminator
RS–422A Dr
APPENDIX C
Signal direction
(convertor unit ⇔ RS-232C device)
–
←
→
←
→
→
→
←
–
RS-422A/485 side
8P terminal block
1
FG
2
SG
3
SDB
4
SDA
2-wire type/
4-wire type
SW1-3 SW1-4
5
RDB
6
RDA
SW1-2
R
7
CSB
8
CSA