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Processing Data from the Reader

Autonomous Configuration Tool v1.0 User Guide 25

Temperature Status Message

A Temperature Status Message will be returned approximately every 250ms (this will vary

based on the Region setting used as it depends on the internal frequency hopping

algorithm which is dependent on the region of operation).

When using Read On GPI Trigger

mode the temperature status message is used as a

keep-alive when GPI is low (reading is turned off).

Table 6: Temperature Status Packet Format

Message Example

A sample temperature status message indicating a temperature of 29C:

Field Value Description

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

Data Length (Len) 0x0A Defines the length, M, of the data field contained in the

packet. Length can be 0 – 248 bytes

OpCode 0x22 Autonomous reader message

Status Word 0x0000 Should not receive non-0x0000 status.

RFU [9 bytes] Reserved for future use. Data can be ignored

Temperature [1 byte] Internal temperature of the module in degrees Celcius.

Note: If temperature exceeds 85C the module will begin

throttling reading and return 0x0504 status in Read-

Cycle Reset/Keep-Alive messages.

CRC-16

Checksum

[2 bytes]

See

CCITT CRC-16 Calculation.

FF 0A 22 00 00 00031b028200820001 1D B7 71

SOH Length OpCode Status Word RFU Temperature CRC

1 2 ... 20 21 22 23 24 25 26 27 28

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