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Interrupt Level Selection
00
cations IC.
1o.
IE. IF)
Locations IC,
10,
JE and IF allow the user to sdect the interrupt levd for each
port.
In a standatd system, VB is shunted for all four ports.
JC
JD
IE
JF
Port
0
Port 1
Port 2
Port
3
0
0
0
0
0
0
0
0
VI7
0
0
0
0
0
0
0
0
VI6
0
0
0
0
0
0
0
0
VI5
0
0
0
0
0
0
0
0
VI4
0----0
G---O
0----0
C)---O
VB
0
0
0
0
0
0
0
0
VI2
0
0
0
0
0
0
0
0
VII
0
0
0
0
0
0
0
0
VIO
PORT CONNECTIONS
The four serial ports ate connected to four connectors on the I/O pand using cables with
the following connections:
480 Boud
I/O Panel
Signal
RS-232C
j(X)
Connector
Name
Circuit
Pin Number
Pin Number
Transmi t Data
BA
3
2
(Data to Modem)
Receive Data
BS
,
3
Q)ata from Modem)
\.....-'
Request to Send
CA
7
<4
Cleat to Send
CB
9
5
Data Set Ready
CC
11
6
Signal Ground
AB
13
7
Data Terminal Ready
CD
14
20
Data Cat rier D et ect
CE
15
8
Ring Indicator
CE
18
2.2
IMS International
5000 Series Microcomputer s/7.0 1.8 3/P age 59
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