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Appendix A
62
HA0302T Rev A Feb 2016
A.4.3 Digital Inputs
The digital inputs used in the controller are of the standard CMOS logic gate type with
TTL compatible input levels and a built-in pull-up resistor (10 kOhm to +5V). They can
be connected directly to mechanical switches, open-collector type outputs or most
type of logic outputs.
Fig. A.10 Digital Input Schematic (protection circuitry not shown)
When connected to a switch, the inputs will read as logic LOW if the switch is open
circuit and HIGH if the switch is closed. When connected to a logic output, or any other
voltage source, the input is guaranteed to read LOW if the voltage is above 2.4V and
HIGH when the output is below 0.8 V. Please see the APTServer helpfile for details
on software calls used to control these logic IO.
A.4.4 +5 Volt Supply
A +5 V, 250 mA supply is provided for interfacing to external circuits that require a
power source.
Caution
The voltage applied to the digital inputs must be within the range
0 V to +7V DC, or damage to the outputs may occur.
Caution
Do not exceed the 250 mA maximum output current. For applications
requiring higher currents an external power supply must be used.
10K
gnd
5V
IN