E 10210 12 - 2005
Protocols:
MODULAR X6 CCTALK VALIDATOR 12
6: BUSY, the Validator is busy doing an operation and cannot attend the command.
3.6
Data
The range of values that each data byte can take is from 0 a 255.
The meaning of the data depends on the command to execute.
3.7
Checksum
The “Checksum” is the value that makes the 8 lower bits of the sum of all the bytes in the
message, including the checksum, give result ‘0’.
For example, the message [01] [00] [02] [00] will be followed by the checksum [253]
because:
1 + 0 + 2 + 0 + 253 = 256 = 0.
3.8
Temporary requirements
Maximum time between bytes:
The maximum time between two bytes in the same message is 50 ms. If it is exceeded the
communication programme will reset the communication variables and will prepare for the
reception of a new message.
Maximum time between command and reply:
The maximum reply time to a command depends on the time that it takes the Validator to
process the command. This time is, by default, 50 ms, if another value has not been specified
in the definition of the command.
Minimum time from the power on until the sending of the first command:
The minimum time it takes from power on to the Validator until the first command is sent is
250 ms.
