DG600F data reading by a serial port

Hi.

I need to make a commuication between a DG600F coin acceptor and an arduino uno, using a RS232 serial port.

When we insert a coin, we would obtain a value between 0 and 6 but the card always receives 255.

Here is the code and the output console. There is also the documentation : https://mechanicape.nl/sites/default/files/coin-acceptor-programmable-6coin-types-datasheet.pdf

By the way, we seen that the data cable send a value with a really low voltage (about 0.2 V), is this a kind of problem ?

Thanks for answering,

Oshikaru.

Hi !
Could you solve the problem?