GM60- 2D Ring Barcode Reader SEN0486 - CRC check in UART mode disabeld?
egg67 2025-05-08 20:05:22 532 Views3 Replies Hi there,
Accessing the GM60 aka 2D Ring Barcode reader ( SEN0486) through UART.
Found a datasheet from some other provider of a similar part.
Registers and communication protocol seems to fit with what the sensor expects, and this is in accordance with the GM60library provided by DFRobot.
But the Library provided seems to ignore the CRC-CCITT check defined in other datasheets.
And replaces it with 0xAB,0xCD on the master, and 0x33,0x31 on the Slave.
Does this simply mean that the CRC routine is disabled on the DFRobot implementation ?
Thanks
Regards
Eric
If you're using the DFRobot library, stick with their expected packet format (with 0xAB, 0xCD) and do not include CRC unless you plan to reconfigure the scanner and implement CRC logic yourself.
ahsrab.rifat Can't use the library directly, as I have to use C# to get the reader setup and working with the rest of my application.
Also got the CRC-CCITT implemented in other applications, that's not the problem.
What's bothering me more is the lack of information about the non implementation of the CRC in there ring.
You have to dig the info out from the library, and then make assumption that they just chose not to use it.
But it's working now so I'll just stick to the packet format given into the library.
I'd guess it's just a design choice they made to ease the handling of the Ring.
But thanks anyway for your answer.
ok fair enough, I just found out a small line written in the GM60 datasheet from another vendor that states:
Note: users can fill 0xAB 0xCD at CRC byte when CRC validation is not required.
but it's not really obvious at first since it is among way too much text, not specifically coming out from the rest.
