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Monitoring the four sensors above, it can be seen that sensor 1 is high. Press any key to exit
this function.
Testing Sense Thresholds
1. In GND/Open mode, VGTHL is 4.5V min and VGTHH is 10.5V max. This can be tested by
connecting a voltage source to the Sensor1 input pins on connectors J3, J8, J10 and J14. Make
sure the ground connection is connected to the GND reference for this channel. Set the Sense
Input voltage to 0V, then press the short cut 'z' key to run the monitor program, all four sensors
U3 will be read in a loop, as shown below.
The screen above is monitoring U3 sensors, '0000' means all sensors are reading low.
2. Now increase the voltage source up to 9V, then increase the voltage slowly, to 10.5V, LED1
and LED S1 on the board should be lit, the screen should now read 1000, as shown below:
Holt Integrated Circuits
9
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