Application tag commands, Field length value – ThingMagic M5e-Compact User Manual

Page 118

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Application Tag Commands

118

Command Set

Here is an example response to the example request specified above. The response
contains two tags as specified in the Tag Count field each with its EPC info and requested
tag read metadata: Read Count, AntennaID and Timestamp:

Tag Data Length

1

2 byte

Length, in bits, of the tag data read for
this tag. This value indicates how many
bytes (ceiling[bits/8]), up to 32, will fol-
low.

Example:

if the value is 0x1D (29) then 4

bytes will follow:
29/4 = 3.625 -- ceiling(3.625) = 4.

Tag Data

1

N bytes

Number of bytes of tag data as specified
in

Tag Data Length

EPC Length

2 bytes

Number of bits in EPC including PC and
CRC bits

PC Word

2 bytes

Tag EPC Protocol Control bits

EPC ID

N bytes

Tag EPC.

Tag CRC

2 bytes

Tag EPC CRC

Repeat fields starting at

Read Count

for remaining tags in message as defined by

Tag Count

CRC

2 bytes

Message CRC

1 - Conditionally returned depending on the Metadata Fields specified in the request.

FF

34

29

00

00

00 15

00 02

SO

H

Length

OpCod

e

Status

Metadata

Flags

Read
Options

Tag
Count

22

11

02

50

CE

F6

00

80

31

C1

11

11

22

22

33

33

44

44

55

55

66

66

FB

15

Read

Count

Ant
ID

Timestamp

EPC
Length

PC Word

Tag EPC

Tag CRC

OE

11

04

1D

3D

3C

00

80

30

00

05

00

00

00

00

00

00

00

00

00

23

54

4A

C8

Read

Count

Ant
ID

Timestamp

EPC
Length

PC Word

Tag EPC

Tag CRC

Field

Length

Value

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