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SERIAL PORT CONNECTIONS
The two leftmost connectors on the upper edge of the board,
J1
and 12, are connected to
the I/O pand using a cable with the following connections.
- ' ,
Signal Name
Protective ground
Signal Ground
Transmit Data
Receive Data
Request to Send
Clear to Send
Data Set Ready
Data Terminal Ready
Ring Indicator
C' at
a
Carrier D et ec t
Transmi t Clock
Receive Clock
RS-232C
Circuit
AA
AB
BA
BB
CA
CB
CC
CD
CE
CF
DB
DD
740 Board
11 or 12 Connect or
Pin Number
1
13
3
5
7
9
11
14
18
15
4
8
I/O Panel
Channel
Pin Number
1
7
2
3
4
5
6
20
22
8
15
17
11 <1r.d 12 on the first 740 boarc are usually connected to channels 3 and 4, respectively.
The next 740 is usually connected to channds 5 and 6, the third 740 to channels 7 and 8,
etc.
PARALLEL PORT CQNNECTIONS
Connector 13 on the right side of the upper edge of the board is a
compatible with the Bdl 801 Automatic Calling Unit.
It is conr.ected
using a cable with the following connections:
740 Board
ACU
J
3 Connect or
Signal Name
Circuit
Pin Number
Frarr.c ground
FGD
1
Signal Ground
SGD
13
Digi t Present
DPR
3
Abandon Call-Retry
ACR
5
Call Request
CRQ
7
Present Next Digit
P~'D
9
Power Indication
PVlI
11
Data
~et
Status
DSS
25
Number Bit 1
NBI
2
Number Bit 2
NB2
4
Number Bit 4
NB4
6
Number Bit 8
NBB
8
D at a Line Occupied
DLO
18
10 bit parallel port
to the I/O Fanel by
I/O Panel
Channel
Pin Number
1
7
J
2
3
4
5
6
13
14
15
16
17
22
\
J
IMS International
5000 Series Microcomputers/7.01.83/page 64
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