Protocol: COIN VALIDATOR L86S PS
3
10044 UK 11 -2003
So the Validator can start communication with the terminal, the Confirmation input must be
high (pull-up) or open circuit, because the contrary would make it carry out a Hardware Test.
1.4. FORMAT
FORMAT of CHARACTER TRANSMISSION
Communication is asynchronous and at 56,250 bauds.
The format of the bytes transmitted is 1 start bit, 8 data bits, no parity bit and 1 stop bit.
MESSAGE FORMAT
All transmissions have the following format:
[Nº bytes]
[Command]
[Data 1]
...
[Data N]
[Checksum]
A message is of a variable quantity of data, up to a maximum of 40.
The checksum is calculated so the sum (of 8 bits) of the whole message is 0.
If a message does not have any data, the package transmitted is:
[00H]
[Command]
[Checksum]
REPLY MESSAGES
There are only two possible reply messages:
ACKNOWLEDGEMENT (ACK)
Which has the following format:
[Nº bytes]
[00H]
[Command]
[Data 1]
...
[Data N]
[Checksum]
Where [Command] is the command code to which it is replying.
