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

COMMAND MAPPING

PAGE 32 OF 67

4.3 CBX - RESPONSE PACKET STRUCTURE

After performing a command, the Gateway or RFID controller will issue a host-bound

response packet. Below is the packet structure of a standard CBx response message.

WORD # RESPONSE PACKET ELEMENT MSB LSB

Overall Length: 2-byte integer indicating

the number of “words” in the response

packet. This value will always be at least 6

(+ number of any data words retrieved).

0x00 0x06 + (number

of any retrieved

words)

0xAA in MSB

Command Echo in LSB

0xAA <Command

Echo>

03 Instance Counter: 1-byte value indicating

the number of responses generated by the

Node ID identified in the LSB (see details

below).

Node ID Echo: 1-byte value indicating the

Node ID of the controller that performed

the command.

Month and Day Timestamp

Hour and Minute Timestamp

Second Timestamp in MSB

Additional Data Length in LSB: 1-byte

value indicates number of additional bytes

retrieved.

Retrieved Data Bytes 1 and 2: holds 2

bytes of retrieved data from tag reads,

serial numbers, etc. (when applicable)

Table 4-2: CBx - Response Packet Structure

NSTANCE

OUNTER

The Instance Counter is a one-byte value used by the Subnet16 Gateway to track

the number of responses generated by the controller at a given Node ID. The

Gateway tallies, in its internal RAM, separate Instance Counter values for each Node

ID.

A Node ID’s Instance Counter will be incremented by one following each response. If,

for example, the controller at Node 01 has generated 10 responses, its Instance

Counter value will read 0x0A. However, when the Gateway is rebooted or power-

cycled, the Instance Counter values for all Node IDs will be reset to zero (0x00).

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 66 67

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