Shenzhen ITLONG Intelligent Technology CO. LTD HLD-DT-A Manuel D’Utilisation
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Chapter 5 Common troubleshooting
and maintenance
5.1 Common troubleshooting and maintenance
The following are some possible phenomenons and simple inspection
methods. Please cut off power supply before any operation on the
controlling hardware devices.
Symptom 1：The device can not communicated with PC after
devices connected.
Diagnosis
：
Cause of issues
Troubleshooting method
485 communication line fault
Check the wiring and wire it correctly
Communication converter
failure
Change the communication converter
The software serial port is set
incorrectly
Put into the correct serial port
Communication distance too
far
Consider adding a relay amplifier
Symptom 2：When the elevator is powered on, the reader is not
responsive.
Diagnosis：
Cause of issues
Troubleshooting method
No system encryption key
Read the management card
The card is not yet issued
with authorization
Reissue the card
The card not belongs to this
Change the card