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Appendix C
Pin Assignments
RS422 Interface
C 2
Pin Number
Signal
38
Acknowledge
40
Reset
42
Message
44
Selector
46
Command Data
48
Request
50
Input/Output
All odd pins (except pin 25) connect to ground. Either leave pin 25 open or
connect it to ground.
Reference: American National Standard X3T9.2/82–2
Table 1.F
RS422 Pin Assignments
Pin Number
Signal
1
Shield
2
Signaling Rate Indicator
3
Spare
4
Send Data
5
Send Timing
6
Receive Data
7
Request to Send
8
Receive Timing
9
Clear to Send
10
Local Loopback
11
Data Mode
12
Terminal Ready
13
Receiver Ready
14
Remote Loopback
Abbreviation
ACK
RST
MSG
SEL
C/D
REQ
I/O
Abbreviation
Shield
SI
Spare
SD
ST
RD
RS
RT
CS
LL
DM
TR
RR
RL
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