7-6
PQM Power Quality Meter
GE Power Management
7.2 MODBUS FUNCTIONS
7 MODBUS COMMUNICATIONS
7
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
11
message for slave 17
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.
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