Ametek 7124 Instruction Manual page 192

Appendix B, PINOUTS
B.3 Digital I/O Port Connectors
B-2
8-bit TTL-compatible port. On the Main Console, each bit is configurable as an input
or output. If configured as an output, the bit status can be set, and if configured as an
input it can be read, from the front panel or via the computer interfaces. On the 7124
RCU each bit can only be used as an output.
When set as an output, each line can drive three LSTTL loads. When set as an input
(Main Console only) each input presents one LSTTL load. The connector will mate
with a 20-pin IDC header plug (not supplied). The pinout is as follows:-
Pin Function
1 Ground
2 Ground
3 D0
4 Ground
5 D1
6 Ground
7 D2
8 Ground
9 D3
10 Ground
11 D4
12 Ground
13 D5
14 Ground
15 D6
16 Ground
17 D7
18 Ground
19 N/C
20 +5 V
D0 = Least Significant Bit
D7 = Most Significant Bit
Figure B-3, Digital I/O Port Connector
(Main Console and 7124 RCU)