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SG4P X.21 Cable Specifications

The SG4P X.21 cable is an HD62 to 4 x DB15 male connections. To retain FCC Class A qualification all cables must be fully shielded and the shielding must be connected to the metal connectors.
P1 -- HD62 Male with screws --- |--- P2 -- DB15 Male
|--- P3 -- DB15 Male
|--- P4 -- DB15 Male
|--- P5 -- DB15 Male

P1

  

P2

  

P1

  

P3
20
 Tx Data0 - A
2
15
 Tx Data1 - A
2
19
 RTS0 - A
3
14
 RTS1 - A
3
18
 Rx Data0 - A
4
13
 Rx Data1 - A
4
17
 DCD0 - A
5
12
 DCD1 - A
5
42
 Clock0 - A
6
37
 Clock1 - A
6
40
 Ground
8
35
 Ground
8
39
 Tx Data0 - B
9
34
 Tx Data1 - B
9
38
 RTS0 - B
10
33
 RTS1 - B
10
62
 Rx Data0 - B
11
57
 Rx Data1 - B
11
61
 DCD0 - B
12
56
 DCD1 - B
12
60
 Clock0 - B
13
55
 Clock1 - B
13

P1

  

P3

  

P1

  

P4
9
 Tx Data2 - A
2
4
 Tx Data3 - A
2
8
 RTS2 - A
3
3
 RTS3 - A
3
7
 Rx Data2 - A
4
2
 Rx Data3 - A
4
6
 DCD2 - A
5
1
 DCD3 - A
5
31
 Clock2 - A
6
26
 Clock3 - A
6
29
 Ground
8
24
 Ground
8
28
 Tx Data2 - B
9
23
 Tx Data3 - B
9
27
 RTS2 - B
10
22
 RTS3 - B
10
52
 Rx Data2 - B
11
47
 Rx Data3 - B
11
51
 DCD2 - B
12
46
 DCD3 - B
12
50
 Clock2 - B
13
45
 Clock3 - B
13

Use shielded cable approx. 6 feet in length and for the HD62 use a metalized plastic covers. Ensure the shielding is soldered to the metal of the connectors (HD62 and DB15).Label each cable near the DB15 connectors as follows:
P2 - Link 0

P3 - Link 1

P4 - Link 2

P5 - Link 3
Rx=Receive, Tx=Transmit, CTS=Clear to Send, RTS=Ready to Send,
DTR=Data Terminal Ready, DSR=Data Set Ready, DCD=Data Carrier Detect