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HHR-4X66 Single-lane Kits - Troubleshooting
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Access Granted Response
The Access Granted Response is controlled by the LED In pin. The LED In pin is a digital I/O pin that is normal
at 5V and active at 0V. The Access Granted Response can only be activated within 5 seconds of a credential
being presented to the reader.
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Make sure the LED In pin on Board A is connected to an output on the access controller.
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Make sure the LED In pin on Board B is connected to an output on the access controller.
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Make sure the access controller is configured to activate the output for Board A and Board B when a valid
credential is received.
If the connection to the access controllers is in place and working correctly, the next step is to check is the idle
voltage of the LED In pin. The LED In pin idles at 5V, if the voltage is below 4.4V then that is likely the cause of
the problem.
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Measure the DC voltage between LED In and ground on Board A.
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Measure the DC voltage between LED In and ground on Board B.
If the voltage on the LED In pin is between 1V and 4.4V, then an external pull-up resistor can be used to recover
the pin. If the voltage on the LED In pin is lower than 1V, then it cannot be recovered.
The troubleshooting steps are the same for the Access Granted Response and Access Denied Response,
except that the Access Denied Response is controlled by the Relay 1 In pins on Board A and Board B.
