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Connections and I/O Settings
10
2.5.1 Voltage Source Configuration
The opto-isolated input signals (2.2.1) are activated as short-to-ground. The voltage
for the opto-isolated circuit (see Figure 6) is provided by either the in3.3V
supply (default state) or an external voltage supply via pin 13 on the I/O Port
connector. The input to be activated should be shorted to external voltage supply
ground.
Configure jumper JP2 on the top AB5 card according to the voltage source:
Pin 1 shorted to Pin 2, for an in3.3V source (default factory setting)
Pin 3 shorted to Pin 4, for an ex3.3V voltage source
Connection for
Internal
source
JP2
3
Connection for
External
source
4
1
2
JP2
3
4
1
2
Figure 6: Jumper 2 Configuration
ATTENTION:
Do not short other pins on JP2. Doing so shorts the
external power supply to the +3.3V supply! The input
circuit is limited to sink up to 10 mA but not less than 3
mA.