User's Manual

COBALT UHF-SERIES CHAPTER 8: STANDARD TCP/IP INTERFACE
PAGE 125 OF 140
8.3.1 Standard TCP/IP - Command Structure & Example
In the following example, a 12-byte command has been issued to the Cobalt,
instructing the controller to read six bytes from a tag within RF range. A Timeout
Value of five seconds has been set for the completion of the command.
WORD DESCRIPTION MSB LSB
00 Protocol Header in MSB = 0xFF
Node ID in LSB = default value for Cobalt -IND is
one (0x01)
0xFF 0x01
01 Overall Length: 2-byte integer indicating number
of “words” in the command packet
0x00 0x06
02 MSB = 0xAA
LSB = Command ID: (example: 0x05 – Read
Data)
0xAA 0x05
03 MSB = 0x00
LSB = Node ID: default value for Cobalt -IND is
one (0x01)
0x00 0x01
04 Timeout Value: 2-byte integer measured in .10
(1/10
th
) second increments.
(0x0032 = 50 x .10 or 5 seconds)
0x00 0x32
05 Start Address: 2-byte integer identifies tag
address where read will begin
0x00 0x01
06 Block Size: 2-byte integer indicates number of
bytes to retrieve
0x00 0x06
Table 8-1: Standard TCP/IP - Command Structure & Example