Article ID: GV4-19-02-23-Ch
Released Date: 02/23/2019
Applied to
GV-AS Controllers with Wiegand Interface
Symptom
GV-AS Controller may fail to respond to readers connected through its Wiegand interface, i.e. information received by the Wiegand reader wasn’t transmitted to the GV-AS Controller.
Troubleshooting
The abovementioned symptom may be due to insufficient voltage between the Wiegand interface of GV-AS Controller and the reader. Follow the steps below to commence troubleshooting.
- Make sure the reader is properly connected to the Wiegand port of GV-AS Controller.
- Use a voltage meter to measure the voltage between D0 and GND, as well as D1 and GND of the controller’s Wiegand port.
- If one or both of the measurements are lower than DC 3 V, proceed to the Solution below, if not, please contact our support team (support@geovision.com.tw) for other possible causes for the issue.
To resolve the issue of insufficient voltage, follow the steps below.
- Apply two resistors of 3.3 or 4.7 kΩ to the Wiegand port with insufficient voltage, one between D0 and 12 V, and one between D1 and 12 V, as illustrated.
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- Repeat Step 2 in the Troubleshooting section above to make sure the voltage has now surpassed DC 3 V.
- The GV-AS Controller shall now respond properly to the Wiegand reader.