Operate a Coin Acceptor

The initialization sequence as defined per the MDB Specification is as follows:

M,1

R,08

R,09

R,0F,00

R,0F,0100000000

R,0A

R,0C,000F0000

(Poll, in loop)

Now, below, there is a python program that does this sequence programatically.

Some remarks:

This program follows the advised sequence described in Section 5 of the MDB Specification to Initialize a Coin Acceptor.
The Tube status is always empty
The program is doing nothing with Coin Inserted events
The VMC is not enabling any of the Expansion Features that are allowed for level 3 Coin Acceptors.
If the coin acceptor sends an incorrect message, the sequence is not reinitialized (this is something that must be done if the program is to be used in a real VMC)
Code is not optimized (e.g. Readline must be called after write2Serial, so this could be put in a function)
The goal of this example is to demonstrate and keep it simple, this is not suitable for "Real" VMCs. However, it can serve as a starting point.

from os import read, write

import serial,sys,time

#Commands that need to be sent to the interface

# M,1 -> Activate Master

# R,08 -> Reset Coin Changer

# R,0B -> Obtain Just Reset from Changer~

# R,09

# R,0F,00 -> Request additional Features (LVL 3+ Only)

# R,0F,01ZZZZZZZZ -> To enable desired features (depends on the changer's reply to previous command) (LVL 3+ Only)

# R,0A -> Tube Status

# R,0C,000F0000 # No manual Dispense (Last 2 Bytes), Coin Types 1,2,3 and 4 are accepted (000F , on first 2 bytes)

# R,0B -> Poll (In Loop)

# COMMAND DEFINITION

ENABLE_MASTER="M,1"

RESET_COIN_ACCEPTOR="R,08"

REQUEST_SETUP_INFO="R,09"

EXPANSION_REQUEST="R,0F,00"

EXPANSION_FEATURE_ENABLE="R,0F,0100000000"

TUBE_STATUS_REQUEST="R,0A"

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