User manual

Computer Gateway User Manual B-6 5/96
B.2.5
B.2.5 RS-449 Loopback Connector
• Male connector
• RS-449 standard connector pin assignments
• Connects channels 0 to 1 and 2 to 3 for CLIF test 14
Shield ground
Signal ground/common return
not used
not used
Line present (not RS-449 spec.)
Logic ground
Transmitted data (-) TP1
Transmitted data (+) TP1
Transmit clock (+) TP2
Transmit clock (-) TP2
Received data (-) TP3
Received data (+) TP3
Request to send (+) TP4
Request to send (-) TP4
Receive clock (+) TP5
Receive clock (-) TP5
Clear to send (+) TP6
Clear to send (-) TP6
not used
not used
Data set ready (+) TP7
Data set ready (-) TP7
Data terminal ready (+)
Data terminal ready (-)
Rcvd line signl detect (+)
Rcvd line signl detect (-)
not used
not used
not used
not used
not used
not used
Terminal timing (+)
Terminal timing (-)
not used
not used
not used
1
19
2
20
3
21
4
22
5
23
6
24
7
25
8
26
9
27 
10
28
11
29
12
30
13
31
14
32
15
33
16
34
17
35
18
36
37
Function
Connection in male connector
Note: TPn = Twisted pair line #n
Figure B-5 — RS-449 Loopback Test Connector 3224