Store Single Setpoint - GE Multilin 745 Communications Manual

MODBUS PROTOCOL

Store single setpoint

2–6
Operation Definition
code
0000 No operation
0001 Remote reset
0002 Trigger trace memory
0003 Clear maximum demand
data
0004 Clear event recorder data Performs the same function as the
0005 Clear loss-of-life data
0006 Clear trace memory
0007 Clear energy data
Modbus implementation: Preset single register
GE Multilin implementation: Store single setpoint
This function code allows the master to modify the contents of a single setpoint register in
the addressed slave device. The response of the slave device to this function code is an
echo of the entire master query message.
Message format and example:
Request slave device 11 to write the value 00C8 at setpoint address 1100.
Master query message
Slave address
Function code
Data starting address (high, low)
Data (high, low)
CRC (low, high)
Slave response
Slave address
Function code
Data starting address (high, low)
Data (high, low)
CRC (low, high)
Description
Does not do anything.
Performs the same function as the front panel RESET
key.
Initiates a waveform capture of trace memory and
increments the "Total Number of Trace Triggers"
registers.
Performs the same function as the
DEMAND DATA actual values command.
RECORD DATA actual values command.
Performs the same function as the
LIFE DATA setpoints command.
Clears all trace memory buffers and sets the "Total
number of trace triggers" register to zero.
Performs the same function as the
actual values command.
Example Description
11 query message for slave 11
06 store single setpoint value
11 00 data starting at address 1100
00 C8 data for address 1100 = 00C8
8F F0 CRC computed by master
Example Description
11 response message from slave 11
06 store single setpoint value
11 00 data starting at address 1100
00 C8 data for address 1100 = 00C8
8F F0 CRC computed by slave
745 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
CHAPTER 2: MODBUS PROTOCOL
CLEAR MAX
CLEAR EVENT
CLEAR LOSS-OF-
CLEAR ENERGY