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Signal Connections • 17

Signal Connections

3.1 Connector Pin Assignment

The ACL-7120A comes equipped with five 20-pin insulation displacement

connectors CN1-CN5. CN1 and CN2 are located at the rear plate. CN3, CN4,

and CN5 are located on board. Each of these connectors can be connected

to flat cables of the same type.

CN1 and CN3 are used for digital outputs, CN2 and CN4 are used for digital

inputs, and CN5 is used for the timer/counter. The following diagrams below

show the connector pin assignments:

Legend:

DO Digital Output

DI Digital Input

GND Ground

CLK Clock input for the 8254(8253)

GATE Gate input for the 8254(8253)

OUT Signal output for 8254(8253)

STROBE External signal to latch DI data

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 39 40

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