Meilhaus Electronic ME-1400, Электронное руководство

Страница: 12 / 29

The counter signals work with TTL level (see specifications on page
21) and require a reference to PC ground (PC_GND). The maximum
output current is I
Out
= 2.5 mA.
The GATE and OUT lines of the 82C54 are directly connected with
the corresponding pins of the D-Sub connector. In the CLK-lines
„multiplexer“ are switched between.
3.3.1 Cascading the Counter
The counters of the same component can be cascaded without
external connections.
In spite of cascading the outputs of all counters are also available
at the D-Sub connector.
Cascading the counters is done by software. For programming
please read chapter 4.2 on page 18.