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SERIAL PORT CONNECTIONS
The two connectors, Jl and J2, on the upper edge of the board are connected to
the I/O panel on the rear of the computer.
If
the system has a 645 processor
board, Jl and J 2 are connected to channels 1 and 2 respectively.
Usually Channel
1 is connected to a terminal, and Channel 2 is connected to a serial printer.
If
the 631 board is used to increase I/O capability in a more recent version Jl and
J 2 are connected the next pair of free channels after the slave channels.
The
internal cables have the following connections:
I/O Panel
631 Board
DTE Connect or
RS -23 2
J
(x)
(D
B25)
Signal Name
Circuit
ri!LiL
LlliLit.
Transmit Data
BA
3
2
Receive 0 ata
BB
5
3
Reques t to Send
CA
7
<I-
Clear to Send
CB
9
5
Data Set Ready
CC
11
6
Signal Ground
AB
13
7
Data Terminal Ready
CD
14
20
Data Car rier 0 et ect
CF
15
8
Ring Indicator
CE
18
2
Figure 2-17 631 Boud to I/O Pand Connection (RS-232)
O1annel 1 is connected to a CRT using a cable with the following connections:
CH.I-Console Port
(0 B2 5 Connector>
CRT
(0 B2 5 Connector)
I
0 - - - -
6
8
20
~--
-------------0
7
I
I
0- - -
------------"'""""1)0 3
.--------------0
2
- - 0
..
I
1--0
5
z
0
3
0
5
0
..
0
6
0
7
0
8
0
20
0
Figure 2-18 Computer to CRT Connection (RS-232)
Note:
Refer to the CRT manual to determine if it is necessary to tie pins 4 and
5 and ptns 6, 8, and 20 together.
This requirement will vary from one CRT
manufacturer to another.
IMS International
5000 Series Microcomputers/7.0 1.83/page 52
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