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GP-HR Switch Input Application Notes
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Any combination of the three analogue inputs of the GP-HR Logger can be configured to read switches. Either DPST or SPST switches can be used. A SPST switch will require a pull up resistor for proper operation on the GP-HR Logger.

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DPST Switch Input Circuit

No additional components are required

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SPST Switch Input Circuit

A pull up resistor is required for proper operation of this circuit.

The value of the pull up resistor is dependent on the length of cable between the switch and the logger. We recommend 1M ohm if the switch is 10 metres or less from the logger and 200 K ohms if the switch is 100m from the logger. If the switch is being used with a long cable in an electrically noisy environment an RC filter network across the switch may be required.

R1 = 200 K Ohms to 1M Ohm depending on distance from switch to logger

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Setting up a Switch Input channel using the OmniLog Software

Connect the GP-HR logger to a computer and Run the OmniLog software

From the Logger Control Screen select Channel and Probe Setup

Select Channel 1 to 3 (These are the analog input channels)

From the Probe box select the Switch option as shown

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Notice that after the Switch probe has been chosen the Units in the Unit and Scaling box has been set to switch

Now give the Channel a meaningful Long and Short name in the Logger Channel Name box as shown below

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Click on the Write Unit, Scaling and Calibration values to the Logger button to send the new settings to the logger.

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