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ONO
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The voltage powering the LED in the opto-isolator may either be supplied from an external source through the
V/G pin or
may be powered from the Hono Mini’s in5V supply. The opto-isolator voltage is software
selectable using ASIControl and the setting is stored in the units non-volatile memory,
15.4.2.1 V/G Pin Function - Ground
When using the internal voltage source, the V/G pin becomes ground. Connecting an opto-isolator input to V/G
will turn it on. Approximately 5mA is needed to fully turn on each opto-isolator. When using the in5V
power source then the internal 1K ohm current limiting resistors are all that is needed.
NOTE: In this mode the opto-isolators are not being used as isolators
.
The following diagram shows the connections needed if using this mode.
15.4.2.2 V/G Pin Function
– Power Input
When using an external power source for the opto-isolators, the V/G pin becomes an input for the external
voltage. In this mode, a maximum external voltage of +14V can be used, so as not to damage the opto-isolators.
Use the following diagram as a guide to connections:
V/G
(Ground)
External switch
External switch
1
2
3
4
V/G
1K Ohms
+5V
Switches under software control
+5V
1K Ohms
V/G
(Power Input)
1K Ohms
Input 1..4
Input 1..4
