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RS-232 Loopback Plug Specifications

To retain FCC Class A qualification all cables must be fully shielded and the shielding must be connected to the metal connectors.

SG4P RS-232 Cable

Description
Pin Number
Description

w

HD-62 'I-E' plug

w

DCD 3
1
8
RTS 2
RxData 3
2
9
TxData 2
RTS 3
3
6
DCD 2
TxData 3
4
7
RxData 2
DTR 3
5
27
51
CTS 2
DSR 2
DTR 2
10
22
46
CTS 3
DSR 3
DCD 1
12
19
RTS 0
RxData 1
13
20
TxData 0
RTS 1
14
17
DCD 0
TxData 1
15
18
RxData 0
Dtr 1
16
38
61
CTS0
DSR 0
DTR 0
21
33
56
CTS1
DSR 1
GND
24
29
GND
GND
35
40
GND
Rx Clock 3
Tx Clock 3
DTE Clock 2
44
45
48
49
50
Tx Clock 2
Rx Clock 2
Tx Clock 1
Rx Clock 3
DTE Clock 0
54
55
58
59
60
Rx Clock 0
Tx Clock 0
Unused pins:
11, 23, 25, 26, 28, 30, 31, 32, 34, 36,
37, 39, 41, 42, 43, 47, 52, 53, 57, 62


Rx=Receive, Tx=Transmit, CTS=Clear to Send, RTS=Ready to Send,
DTR=Data Terminal Ready, DSR=Data Set Ready, DCD=Data Carrier Detect