Data General AViiON 4600 Series, Customer Documentation

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Technical Specifications
A-12
014–002091
Integrated I/O Connectors and Signals
This section lists the I/O connectors and signals available on the AViiON 530 and 4600
computer system and system bus daughter boards. For a description of VMEbus
connectors and pin assignments, refer to Setting Up and Installing VMEbus Options in
AViiON

Systems.
Asynchronous Serial Port Connectors
Serial devices connect to the RS-232-C ports through one of three 9-pin, male
D-connectors located on the back of the computer unit. Figure AĆ1 lists the signals
and shows the pin numbers for these serial connectors, labeled A, B, and C.
Pin Signal
*1 Data Carrier Detect <
2 Receive Data <
3 Transmit Data>
4 Data Terminal Ready >
5 Signal Ground
6 Data Set Ready < (ports B and C only)
7 Request to Send >
8 Clear to Send <
9 Ring Indicator < (ports B and C only)
*Proper terminal operation while running the DG/UX

operating system requires the DCD signal pulled up by the
presence of a system board jumper. We describe this jumper
in Chapter 10.
5
9
1 6
(Male)
Figure A-1 Asynchronous Serial Port (RS232A–C) Connector Signals
An adapter cable (part number 005-38420) converts signals from the 9-pin connector
on the computer bulkhead to a 25-pin cable connector. Figure AĆ2 shows the 9- to
25-pin conversion accomplished by the asynchronous adapter cable.
Figure AĆ2 also shows the signal routing in the DB25-to-DB25 cables used with the
adapter cable to connect modems and terminals to the AViiON 530 and 4600 series
computer bulkhead.