3Com CS/2500, Руководство по установке

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A-4 A
PPENDIX
A: P
IN
A
SSIGNMENTS
Figure A-3 Cable Wiring for Serial Port in Automatic RS-422 Selection Mode
Transceiver
Connector
Figure A-4 shows pin numbering for the transceiver connector.
Table A-2 lists pin assignments for this connector.
Figure A-4 Transceiver Connector Pin Numbers
DCE
CS/2500 Pin
TXD+
TXD-
RXD-
RXD+
13
14
16
19
22
25
Table A-2 Transceiver Connector Pin Assignments
Pin Function Circuit Use
1 Control In Shield CI-S Control In circuit shield
2 Collision Presence (+) CI-A Control In circuit A
3 Transmit (+) DO-A Data Out circuit A
4 * Receive Shield DI-S Data In circuit shield
5 Receive (+) DI-A Data In circuit A
6 Power Return VC Voltage common
7 Control Out (+) (unsupported) CO-A Control Out circuit A
8
*
Control Out Shield CO-S Control Out circuit shield
9 Collision Presence (-) CI-B Control In circuit B
10 Transmit (-) DO-B Data Out circuit B
(continued)
• • • • • • • •
• • • • • • •
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15
CS2500BookFile : PinAssignments Page 4 Thursday, December 11, 1997 10:44 AM