User manual

Computer Gateway User Manual B-5 5/96
B.2.4
B.2.4 RS-449 Loopback Cable
• Connects channels 0 to 3 and 2 to 1 for CLIF test 13
• Male-to-male connection
Shield ground
Signal ground/common return
not used
not used
Line present (not RS-449 spec.)
Logic ground
Transmitted data (-) TP1
Transmitted data (+) TP1
Received data (-) TP2
Received data (+) TP2
Transmit clock (+) TP3
Transmit clock (-) TP3
Terminal timing (+)
Terminal timing (-)
Receive clock (+) TP4
Receive clock (-) TP4
Request to send (+) TP5
Request to send (-) TP5
Clear to send (+)
Clear to send (-)
Rcvd line signl detect (+) TP6
Rcvd line signl detect (-) TP6
not used
not used
Data set ready (+) TP7
Data set ready (-) TP7
Data terminal ready (+) TP8
Data terminal ready (-) TP8
not used
not used
not used
not used
not used
not used
not used
not used
not used
1 1
19 19
2 2
20 20
3 3
21 21
4 6
22 24
6 4
24 22
5 8
23 26
17 17
35 35
8 5
26 23
7 13
25  31
9 9
27 27
13 7
31 25
10 10
28 28
11 12
29 30
12 11
30 29
14 14
32 32
15 15
33 33
16 16
34 34
18 18
36 36
37 37
Function CG Side CG Side
Note: TPn = Twisted pair line #n (TP8 not necessary to be twisted pair)
Figure B-4 — RS-449 Loopback Test Cable 3223