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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 |
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