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GE Power Management PQM Power Quality Meter 7-5

7 MODBUS COMMUNICATIONS 7.2 MODBUS FUNCTIONS

7.2.3 FUNCTION CODE 05 - EXECUTE OPERATION

Modbus Implementation:

Force Single Coil

PQM Implementation:

Execute Operation

This function code allows the master to request a PQM to perform specific command operations. The com-

mand numbers listed in the Commands area of the memory map correspond to operation codes for function

code 05.

The operation commands can also be initiated by writing to the Commands area of the memory map using

function code 16. Refer to FUNCTION 16 - PERFORMING COMMANDS section for complete details.

MESSAGE FORMAT AND EXAMPLE:

Reset PQM (operation code 1).

Table 7–2: MASTER/SLAVE PACKET FORMAT FOR FUNCTION CODE 05H

MASTER TRANSMISSION BYTES EXAMPLE DESCRIPTION

SLAVE ADDRESS 1 11 message for slave 17

FUNCTION CODE 1 05 execute operation

OPERATION CODE 2 00 01 reset command (operation code 1)

CODE VALUE 2 FF 00 perform function

CRC 2 DF 6A CRC error code

SLAVE RESPONSE BYTES EXAMPLE DESCRIPTION

SLAVE ADDRESS 1 11 message from slave 17

FUNCTION CODE 1 05 execute operation

OPERATION CODE 2 00 01 operation code 1

CODE VALUE 2 FF 00 perform function

CRC 2 DF 6A CRC error code

GE Power Quality Meter Series User Manual

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