RS-232/EIA-232 Null Modem Cable

DB25 Female Connectors

V.35 DB25 Null Modem Cable

DB25 Female Connectors

V.35 Winchester Null Modem Cable

Detail of Winchester Connector (ISO-2593)

V.35 (34 pin) Female ISO-2593 Connector

RS-422/EIA-530 Null Modem Cable

DB25 Female Connectors

X.21 Null Modem Cable

DB-15 Female Connectors

RS-232/EIA-232 Loopback Plug

DB25 Female Connector

V.35 DB25 Loopback Plug

DB25 Female Connector

V.35 Winchester Loopback Plug

Detail of Winchester Connector (ISO-2593)

V.35 (34 pin) Female ISO-2593 Connector

RS-422/EIA-530 Loopback Plug

DB25 Female Connector

X.21 Loopback Plug

DB15 Female Connector

Table of Commonly Used Interfaces

RS-232 EIA-530 RS-449 V.35

Signal NameSour

ce

Mnem

onic

Pi

n

Mnem

onic

Pi

n

Mnem

onic

Pi

n

Mnem

onicPin

Shield -- -- 1 -- 1 -- 1 -- A

Transmitted Data DTE BA 2 BA (A) 2 SD (A) 4 103 P

BA (B) 1

4

SD (B) 2

2

103 S

Received Data DCE BB 3 BB (A) 3 RD (A) 6 104 R

BB (B) 1

6

RD (B) 2

4

104 T

Request To Send DTE CA 4 CA (A) 4 RS (A) 7 105 C

CA (B) 1

9

RS (B) 2

5

Clear To Send DCE CB 5 CB (A) 5 CS (A) 9 106 D

CB (B) 1

3

CS (B) 2

7

DCE Ready (DSR) DCE CC 6 CC (A) 6 DM (A) 1

1

107 E

CC (B) 2

2

DM (B) 2

9

DTE Ready (DTR) DTE CD 2

0

CD (A) 2

0

TR (A) 1

2

108 H *

CD (B) 2

3

TR (B) 3

0

Signal Ground -- AB 7 AB 7 SG 1

9

102 B

Recv. Line Sig. Det. DCE CF 8 CF (A) 8 RR (A) 1 109 F

(DCD) 3

CF (B) 1

0

RR (B) 3

1

Trans. Sig. Elemt.

Timing

DCE DB 1

5

DB (A) 1

5

ST (A) 5 114 Y

DB (B) 1

2

ST (B) 2

3

114 AA

Recv. Sig. Elemt.

Timing

DCE DD 1

7

DD (A) 1

7

RT (A) 8 115 V

DD (B) 9 RT (B) 2

6

115 X

Local Loopback DTE LL 1

8

LL 1

8

LL 1

0

141 L *

Remote Loopback DTE RL 2

1

RL 2

1

RL 1

4

140 N *

Ring Indicator DCE CE 2

2

-- -- -- -- 125 J *

Trans. Sig. Elemt.

Timing

DTE DA 2

4

DA (A) 2

4

TT (A) 1

7

113 U *

DA (B) 1

1

TT (B) 3

5

113 W *

Test Mode DCE TM 2

5

TM 2

5

TM 1

8

142 NN

*

* Pins are specified in ISO-2593 but are not included in CCITT V.35