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Processing Data from the Reader

Autonomous Configuration Tool v1.0 User Guide 26

Read-Cycle Reset/Keep-Alive

The Read-Cycle Reset/Keep-Alive message are sent once per second and always have a

non-0x0000 Status Word, with 0x0400 indicating normal.

Table 7: Read-Cycle Reset Packet Format

Message Example

A sample Read-cycle Reset/Keep-alive message indicating normal:

A sample Read-cycle Reset/Keep-alive message indicating over-temperature, RF being

throttled temporarily:

Field Value Description

Header (Hdr) 0xFF Defines the start of the packet.

Data Length (Len) 0x00 Cycle reset contains no additional data after the status code.

OpCode 0x22 Autonomous reader message

Status Word [2 bytes]

• 0x0400 indicates a read-cycle start message...also acts

as a heartbeat when the reader is reading but no tags are

in the field.

• 0x0504 indicates the maximum temperature of the

module (85C as reported by

Temperature Status

Message) has been exceeded and reading has been

temporarily throttled.

• Other non-0x0000 fault code. See readerʼs Hardware

Guide for list of fault-codes.

CRC-16

Checksum

[2 bytes]

See

CCITT CRC-16 Calculation.

FF 00 22 04 00 84 E0

SOH Length OpCode Status Word CRC

FF 00 22 05 04 85 E4

SOH Length OpCode Status Word CRC

1 2 ... 21 22 23 24 25 26 27 28

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