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GWY-01-DNT-01 MANUAL – REV. 02 CHAPTER 4:

COMMAND MAPPING

PAGE 31 OF 67

4.2 CBX - 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).

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>

07 Additional Data Byte Values 1 & 2: holds

2 bytes of data used for fills, writes, etc.

(when applicable)

08 Additional Data Byte Values 3 & 4: (when

applicable)

Table 4-1: CBx Command Packet Structure

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 66 67

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