Arduino Mega and MDB protocol with bill validator NV9 Spectral

[antonio1]

I'm at the beginning of the project and over internet information is not very clear, so at this moment I don't have too much information.
I found a thread but it is old and closed with not too much information too.

MDB tester

Hello arduino forums. What I would like to accomplish is to build an MDB tester for my vending company. I need a bit of help though and I really don't know where to start. What I have so far are a few arduino uno 's and some lcd displays. I would like to basically build a tester that I can hook a MDB bill acceptor or coin mech up to, to test them. I need the lcd display to display the amount of money that had been passed through the device in test, and if it rejects the bill or coin it will thr…

So, I need to use Arduino Mega to communicate via serial port through adapter to MDB protocol connected to bank note validator NV9 Spectral.

The problem is hardware adapt from TTL to MDB, TTL use 3.3V serial communication 8 bits and MDB use 15V serial communication 9 bits.

Because this project is nowhere over internet available, we can start from investigating to have this communication available. Arduino should be as master (VMC) to communicate with bill validator as slave.