E 10210 12 - 2005
Protocols:
MODULAR X6 CCTALK VALIDATOR 11
3.3
Number of data bytes
This byte indicates the number of data bytes in the message and not the number total of bytes
of the message. If it is ‘0’, it means that the message does not have any data and in this case
the number total number of bytes of the message will be of 5 bytes (The minimum permitted).
The values 253 to 255 are not permitted in this field and would be considered as the value
252.
The X6 Validator has the capacity to receive up to a maximum of 66 bytes in each string. In
reception, it can receive and calculate the checksum of a string up to 252 bytes, although it
can only process the first 66 (see command REQUEST COMMS STATURS VARIABLES [2]).
3.4
Origin address
The byte ‘Origin address’ indicates the node on the bus that sends the message. The range of
addresses goes from 1 to the 255 (of those 254 correspond to possible addresses of the
Validator).
1: address of the Machine. When the message is sent by the Machine.
2: default address of the Validator on leaving the factory, in communication with only one
slave. When the message is sent by the Validator.
2 to 255: addresses of the Validator in multi-slave communication, configurable using
software with MDCES commands.
3.5
Header
The range of header bytes goes from 0 to 255. The “Header” will never have the value ‘0’ in
the case of messages sent by the Machine.
The Validator can return the following values in the header byte:
0: ACK, the Validator has carried out the command correctly
5: NACK, an error has occurred in the processing of the command or the command has
not been carried out due to the present validator configuration.
