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Pin Number
Signal
15
Incoming Call
16
Select Frequency/Signaling Rate Selector
17
Terminal Timing
18
Test Mode
19
Signal Ground
20
Receive Common
21
Spare
22
Send Data
23
Send Timing
24
Receive Data
25
Request to Send
26
Receive Timing
27
Clear to Send
28
Terminal In Service
29
Data Mode
30
Terminal Ready
31
Receiver Ready
32
Select Standby
33
Signal Quality
34
New Signal
35
Terminal Timing
36
Standby Indicator
37
Send Common
1
Circuit SF and Circuit SR share the same contact number.
Reference: Electronic Industries Association RS-449
Appendix C
Pin Assignments
Abbreviation
IC
1
SF/SR
TT
TM
SG
RC
Spare
SD
ST
RD
RS
RT
CS
IS
DM
TR
RR
SS
SQ
NS
TT
SB
SC
C 3
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