Specifications

GWY-01-DNT-01 MANUAL – REV. 02 CHAPTER 4:
COMMAND MAPPING
PAGE 31 OF 67
4.2 CB X - COMMAND PACKET STRUCTURE
Below is the packet structure of a standard CBx command.
WORD # COMMAND PACKET ELEMENT MSB LSB
01 Overall Length: 2-byte value indicating the
number of “words” in the command packet.
This value will always be at least 6 words.
0x00 0x06 + (number
of any additional
words)
02 Command ID: 0xAA + 1-byte value
indicating command to perform.
0xAA <Command ID>
03 0x00 in MSB, Node ID in LSB
0x00 <Node ID>
04 Timeout Value: 2-byte integer for the
length of time allowed for the completion of
the command, measured in 1 millisecond
units, where 0x07D0 = 2000 x .001 = 2
seconds.
0x07 0xD0
05 Start Address: 2-byte integer indicating the
location of tag memory where a Read/Write
operation will begin (when applicable).
<Start MSB> <Start LSB>
06 Block Size: 2-byte integer indicating the
number of bytes that are to be read from or
written to a tag beginning at the specified
Start Address (when applicable).
<Length
MSB>
<Length LSB>
07 Additional Data Byte Values 1 & 2: holds
2 bytes of data used for fills, writes, etc.
(when applicable)
<D1> <D2>
08 Additional Data Byte Values 3 & 4: (when
applicable)
<D3> <D4>
Table 4-1: CBx Command Packet Structure