Hall Research HR-4P - Manual (Page 10)

Model HR-4P Programmer
10
Figure 9
– Output
Pulse
 If any of the units I/O is configured as an output, you can pulse that output one or more times based on a specific
input condition. The Pulse Width and Delay between Pulses is selectable in milliseconds. The delay is only
required when more than one pulse is being sent.
 Select the Pulse from the Action drop-down menu and pick a desired output channel, the Number of Pulses and
the Pulse Width.
 When done, the user clicks the Add button to append the command as shown in Figure 10.
Figure 10 – Pulse
I/O Control
 The I/O Control tab allows the user to configure any or all four discrete I/O‟s as inputs or outputs.
 An input can be defined as Input-Contact or Input-Voltage. When an input is defined as “contact” you can just use
a contact closure or switch to ground with no additional circuitry, or use a digital signal that swings anywhere from 0
to 24v. In this mode the input of HR-4P is high impedance (>50 KOhm). When an input is defined as “voltage” then
the HR-4P will terminate the input with a 1K ohm resistor to ground. In this mode it will not be able to sense a
contact to ground (since the pull-down resistor is already keeping the pin at ground potential), but it is useful for
sensing DC supplies that can be a DC voltage from 3 to 24 vDC.
A good example is if you want to detect 110 VAC. In that case you can simply use a small 6v DC power adapter
and plug it into the AC line, and tie the 6v DC to the HR-4P. When configured as Voltage input, the 1K resistor will
bleed off and decay the DC signal from the external supply when the AC voltage is disconnected.