About MSC-MOD 20, it is a question.

The firmware version is v2.0.0.
This is the case where N commands are executed across multiple directories.
Although the @ command succeeds and the file exists, the N command becomes !04.
If the file found by the N command is deleted with the D command, the ACK of the D command includes the execution result of the next N command.

Sounds like there is a problem in your code as you are getting out of sync.

1 Like

There is a problem in your code.
I actually tried the @, N, D command, but it does not matter at all.
Have you tried with a PC connected via UART?
First, please connect with PC via UART and execute each command.

e.g. There is a file named TEST.TXT on the microSD card.

1 Like

Thank you.