Pin assignments appendix c, Rs422 interface – Rockwell Automation 1770-M12 Mass Storage Systems User Manual
Page 55
Pin Assignments
Appendix C
CĆ2
Pin Number
Abbreviation
Signal
38
Acknowledge
ACK
40
Reset
RST
42
Message
MSG
44
Selector
SEL
46
Command Data
C/D
48
Request
REQ
50
Input/Output
I/O
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
Abbreviation
1
Shield
Shield
2
Signaling Rate Indicator
SI
3
Spare
Spare
4
Send Data
SD
5
Send Timing
ST
6
Receive Data
RD
7
Request to Send
RS
8
Receive Timing
RT
9
Clear to Send
CS
10
Local Loopback
LL
11
Data Mode
DM
12
Terminal Ready
TR
13
Receiver Ready
RR
14
Remote Loopback
RL
RS422 Interface
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