1、Please check whether the scan indicator light is on and ensure that the hardware is normal
2、Please test with sdk demo，if still not work ,please take a video of issue
http://service.telpo.net:8091/index/user/fetfile?key=Z5AClrVHfYban1pU
select QR Code
select "serial" and open ,then test if can scan barcode
3、Please install serial port assistant，serial port ID is ttyS7 and the baud rate can be set to 115200.Then click on and scan barcode,if you can get the result ,the Signal communication is normal.
http://service.telpo.net:8091/index/user/fetfile?key=6juLUsSyVltHAcJF
4、Please refer to the sdk document and use mHardReader.setHardReaderListener(New HardreaderLisetener ()command
QR code scanning is serial, and our SDK has encapsulated the settings of serial port. The corresponding serial port information is (/dev/ttyS7, 115200)
5、if still not work ,please scan the setting barcode to change to series port
6.if firmware is old and not After 2022 October .Please download the new firmware and tool.please provide the sn of devices and contact with telpo engineer to get the tool and firmware