77
Pin Name Dir Description Pin Name Dir Description
1 GND
Shield Ground 19 GND
Ground
2 SRI
Signal Rate Indicator 20 RC
Receive Twister-Pair
Common
3 n/c - Spare 21 GND
Spare Twister-Pair
Return
4 SD
Send Data 22 /SD
Send Data TPR
5 ST
Send Timing 23 GND
Send Timing TPR
6 RD
Receive Data 24 GND
Receive Timing TPR
7 RTS
Request To Send 25 /RS
Request To Send TPR
8 RR
Receiver Ready 26 /RT
Receive Timing TPR
9 CTS
Clear To Send 27 /CS
Clear To Send TPR
10 LL
Local Loopback 28 IS
Terminal In Service
11 DM
Data Modem 29 /DM
Data Mode TPR
12 TR
Terminal Ready 30 /TR
Terminal Ready TPR
13 RR
Receiver Ready 31 /RR
Receiver TPR
14 RL
Remote Loopback 32 SS
Select Standby
15 IC
Incoming Call 33 SQ
Signal Quality
16 SF/SR
Select Frequency/Select Rate 34 NS
New Signal
17 TT
Terminal Timing 35 /TT
Terminal Timing TPR
18 TM
Test Mode
Note: Direction is DTE (Computer) relative DCE (Modem).
RS422 9pin
(at the DTE)
(at the DCE)
CORRECT?
9 PIN D-SUB MALE at the DTE (Computer).
9 PIN D-SUB FEMALE at the DCE (Modem).
Pin Name Description
1 Shield
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