Prevac MG15, Руководство пользователя, Страница: 94 / 124

COMMUNICATION MULTI GAUGE CONTROLLER
. . . x - WRITE WORD
Query:
Device
address
Function
code x
Address of word to
be written
Value to be written CRC
byte byte MSB LSB MSB LSB MSB LSB
Response:
Device
address
Function
code x
Address of word to
be written
Value to be written CRC
byte byte MSB LSB MSB LSB MSB LSB
Slave device is identical with query. Except when transmission error or incorrect data occur. Pos-
sible responses in case of error are described in table . . .
Example:
For IG set gauge type to IE .
Query:
TX: A A C
Response:
RX: A A C
. . . x - WRITE N-WORDS
It enables sequential writing of a number of parameters within one transmission.
It is necessary to de ine the address of the irst parameter and number of words to be written after
this address.
Query:
Device
address
Function
code x
First word
address
Number of
words to be
written
Number
of data
bytes
Data ... CRC
byte byte MSB LSB MSB LSB bajt MSB
LSB
... MSB
LSB
Response:
Device
address
Function code
x
First word address Number of written
words
CRC
byte byte MSB LSB MSB LSB MSB LSB
The maximum number of words to be written is which corresponds to bytes. The irst two
bytes are the data for the irst parameter ( irst MSB in organisation). The subsequent byte pairs are
the data for the following parameters. Trying to write using function x of data blocks containing
non-con igured (empty) cells, or read only, results in communication error and discarding of the
data. All the further values in the block will also be discarded.
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