User manual

Computer Gateway User Manual B-11 5/96
B.2.10
B.2.10 RS-232C Loopback Cable
• Male-to-male connection
• Connects channels 0 to 3 and 2 to 1 for CLIF test 13
CAUTION
Because the two cable ends are pinned differently, care should be taken to position the cable
correctly.
Function Clock Source Side Nonclock Source Side
Shield ground 1 1
Transmitted data 2 3
Received data 3 2
Request to send 4 8
Clear to send 5 4
Received line signal detector 8 5
Signal ground/common return 7 7
Line present (not RS-232C spec) 9 9
Logic ground 10 10
not used 11 11
not used 12 12
not used 13 13
Clock source 14 14
Transmit clock 15 17
Receive clock 17 15
Clock source 23 23
not used 16 16
not used 18 18
not used 19 19
Data set ready 6 20
Data terminal ready 20 6
not used 21 21
not used 22 22
not used 24 24
not used 25 25
Figure B-10 — RS-232C Loopback Cable 3228