User Guide

Table Of Contents
eGo/SeGo Tag Command Set
78
Command Syntax
All eGo/SeGo tag commands follow the same standard syntax. Each command has the
following common fields followed by additional fields required for the specific operation
being performed:
Standard Request Fields
Group Select Options
The following table defines the Command Type values to use for the desired Group
Select Option when performing a
Read Tag ID Single (21h), Read Tag ID Multiple (22h) or
Write Tag Data (24h). The Group Select Option along with the Select Fields (Byte Address,
Byte Mask and Word Data) determine which tags will respond to the specified query.
Group Select Options
Field Value Description
TM OpCode 0xXX
TM OpCode as defined in eGo/SeGo Tag Com-
mands
Timeout [2 bytes] Indicates how long the command should spend
attempting the operation, in milliseconds.
TM Options 0x01 Must be set to 0x01, indicating Command Type and
eGo/SeGo specific fields to follow.
Command Type [1 byte] Depending on the operation indicates either the
Group Select Options to apply or a specific sub-
command.
Command
Type Value
Group Select Option Tag Selection Behavior
0x00 GROUP_SELECT_EQ All tags in the field whose data EQUALS the
specified Select Fields will respond.
0x01 GROUP_SELECT_NE All tags in the field whose data does NOT
EQUAL the specified Select Fields will
respond.
0X02 GROUP_SELECT_GT All tags in the field whose data is GREATER
THAN the specified Select Fields will
respond.