GE Multilin PQM User Manual

7–8 PQM POWER QUALITY METER – INSTRUCTION MANUAL
MODBUS FUNCTIONS CHAPTER 7: MODBUS COMMUNICATIONS
7.2.4 Function Code
05 – Broadcast
Command
Modbus Implementation: Force Single Coil
PQM Implementation: Execute Operation
This function code allows the master to request all PQMs on a particular communications
link to Clear All Demand Data. The PQM will recognize a packet as being a broadcast
command if the SLAVE ADDRESS is transmitted as 0. Below is an example of the Broadcast
Command to Clear All Demand Data.
MESSAGE FORMAT AND EXAMPLE:
Clear All Demand Data on all PQMs (operation code 34).
Table 7–3: Master/Slave Packet Format for Broadcast Command
MASTER TRANSMISSION BYTES EXAMPLE DESCRIPTION
SLAVE ADDRESS 1 00
broadcast command
(address = 0)
FUNCTION CODE 1 05 execute operation
OPERATION CODE 2 00 22
clear all demand data
(operation code 34)
CODE VALUE 2 FF 00 perform function
CRC 2 2D E1 CRC error code
SLAVE RESPONSE BYTES EXAMPLE DESCRIPTION
Slave does not respond back to the master.
Courtesy of NationalSwitchgear.com

GE Multilin PQM Specifications

General

Brand	GE
Model	Multilin PQM
Category	Measuring Instruments
Language	English