Pin

EIA

V.24

Abbrev.

Function

1

AA

-

CG

Chassic Ground

2

BA

103

TD

Transmitted Data

3

BB

104

RD

Received Data

4

CA

105

RTS

Request To Send

5

CB

106

CTS

Clear To Send

6

CC

107

DSR

Data Set Ready DTE

7

AB

108

SG

Signal Ground

8

CF

109

DCD

Carrier Detect

9

-

-

-

Pos DC Test Volt

10

-

-

-

Neg DC Test Volt

11

-

-

QM

Equalizer Mode

12

SCF

112

SDCD

Secondary DCD

13

SCB

121

SCTS

Secondary CTS

14

SBA

118

STD

Secondary TD

15

DB

114

TC

Transmitter Clock

16

SBB

119

SRD

Secondary RD

17

DD

115

RC

Receiver Clock DTE

18

-

-

DCR

Divided Clock RX

19

SCA

120

SRTS

Secondary RTSDCE

20

CD

108

DTR

Data Terminal Ready

21

CG

110

SQ

Signal Quality

22

CE

125

RI

Ring Indicator

23

CH/CL

111

CI

Data Rate Selector

24

DA

113

XTCLK

External TX Clock

25

TM

142

-

Busy