Allen-Bradley 1779-KFMR User Manual page 187

Data highway ii synchronous-device interface
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Chapter 12
For the read values command, you must include a DATA SIZE+1 field. To
specify the value in this field, determine the number of bytes required for
the parameter value you are reading and add one byte. The total is the
value you specify. The one byte you add accounts for the SIZ field that
will accompany the data in the reply message, shown below:
Success Reply Format:
The data contained in the DATA field is the value of the parameter you
specified in the PID field of the command message.
Unless otherwise stated, each block shown represents one byte.
All values we show in the fields are hexadecimal unless otherwise stated.
Set Values
Use this command to set the values of any of the parameters described in
"Parameters" (except for host-board ID and MAC-board ID). All
parameters are shown in hexadecimal.

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