6
7
8
9
1
2
3
4
5
659
Using an RS-232C/RS-422A Convertor Unit
APPENDIX C
RS-232C Connector
Connector
pin No.
Signal name
Abbreviation
Signal direction
(convertor unit
⇔
RS-232C device)
1
Not used
–
–
2
Send data
SD
←
3
Receive data
RD
→
4
Request to send
(shorted to CS internally)
RS
←
5
Clear to send
(shorted to RS internally)
CS
→
6
+5 V (150 mA) input for convertor unit
+5 V
→
7
Data set ready
(shorted to ER internally)
DR
→
8
Data terminal ready
(shorted to DR internally)
ER
←
9
Signal ground
SG
–
*
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.
SW1-6
Terminator
R
R
D-SUB 9P CASE
+5 V
SG
SD
RD
RS
CS
DR
ER
6
9
2
3
4
5
7
8
POWER
LED
RS-232C
Dr/Rec
RS-422A/485 Dr/Rec
DC-DC
IS_5 V
IS_0 V
FG
1
2
3
4
6
5
7
8
SW1-5
SW1-4
SG
SDB
SDA
RDB
RDA
CSB
CSA
SW1-2
RS–422A Dr
SW1-3
RS-232C side
Fuse
Convertor
RS-422A/485 side
8P terminal block
Photocoupler
2-wire type/
4-wire type
R
R
R
R
L
L
REG
Summary of Contents for NT31 Series
Page 1: ...Cat No V043 E1 2 Programmable Terminal NT31 31C OPERATION MANUAL...
Page 2: ...iii NT31 31C Programmable Terminal Operation Manual Produced March 1999...
Page 41: ...30 Before Operating Section 1 5...
Page 75: ...64 Using a Memory Unit NT31 NT31C without V1 Section 3 6...
Page 160: ...149...
Page 174: ...163...
Page 193: ...182...
Page 211: ...200...
Page 235: ...224 c Return to the screen on which screens are specified...
Page 262: ...251...
Page 360: ...349 It is not possible to control a gloval window by touch switch operation...
Page 468: ...457 254 255 0 2 7 1 4 5 3 3 0 0 0 5 9 8 0 3...
Page 476: ...465 Special Functions Section 7 16...
Page 495: ...484 OFF...
Page 610: ...599 Commands Responses Section 9 3...
Page 630: ...619 Examples of Actual Applications of Memory Link Section 10 2...