problems with reading on acr122u - timing

[ghost]

If I put a for example a classic card on acr122u the reader can identify it. If I configure the cham (RevG) to MF_CLASSIC_4K_7B or other the acr122u couldn't identify it correct. No stable connection is possible. With other tags no problem only with the cham.

Any ideas how to solve it?

[ghost]

I tested the reaction times with a reader at a printer and there it is really slow.

Already used autocalibrate. At the beginning with an older firmware version it worked better. At the moment I couldn’t find the problem of it.

Any ideas how to get it better?

[Peterthegreat]

Autocalibrate is part of the reading process, it sets the correct threshold according to the current card. The emulation is not affected.

• try another reader
• try battery mode
• find the older, working fw

[geo-rg]

@gtpy Can you tell me which older firmware did work better?

[ghost]

@geo-rg I'll try to test it the next days or at the weekend. You'll hear from me.

[ghost]

Lost sight of this issue. I will soon deal with it again.