Name: Pilot Communications SPM33
Brand: Pilot Communications
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Below list describes the meanings of exception codes:

Function Code Meaning

01 illegal function

code

SPM33 Modbus support the function code include: 01H,

02H, 03H, 05H, and 10H.

This code means the slave device receive an illegal

function code, or the SPM33 receive the error command.

02 illegal function

code

SPM33 receive the address referenced in the data field

is an invalid address.

03 illegal function

code

The requested register number is too long.

8.2.5. Broadcast Packets

SPM33 support broadcast commands when communicating in MODBUS mode.

Do write command 0x10 for timing.

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Pilot Communications SPM33 Specifications

General