Function Code 05 - Broadcast Command - GE Power Quality Meter Series Instruction Manual

7.2 MODBUS FUNCTIONS
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
SLAVE ADDRESS
FUNCTION CODE
OPERATION CODE
CODE VALUE
CRC
SLAVE RESPONSE
Slave does not respond back to the master.
7
7-6
7.2.4 FUNCTION CODE 05 – BROADCAST COMMAND
BYTES EXAMPLE
1 11
1 05
2 00 22
2 FF 00
2 2D E1
BYTES EXAMPLE
PQM Power Quality Meter
7 MODBUS COMMUNICATIONS
DESCRIPTION
message for slave 17
execute operation
clear all demand data (operation code 34)
perform function
CRC error code
DESCRIPTION
GE Power Management