GE 750 Manual page 20

CLOCK SYNCHRONIZATION OF MULTIPLE RELAYS
3 - 8
Slave Response
Slave Address
Function Code
Data Starting Address
Number of Bytes
CRC (low, high)
The following table shows the format of the master and slave packets for a master device
sending the Store Time operation code to all slave devices on the communications link as
required by step three of the procedure.
Master Transmission
Slave Address
Function Code
Operation Code
Code Value
CRC (Low, High)
Slave Response
No response from slave.
Bytes Example
1 11 message from slave 11
1 10 store multiple setpoints
2 10 06 data starting at 1006h
2 00 08 4 setpoints = 8 bytes total
2 27 9B computed CRC error code
Bytes Example
1 11 message for slave 11
1 05 execute operation
2 00 04 set time
2 FF 00 perform operation
2 CC 2A computed CRC error code
Bytes Example
750/760 FEEDER MANAGEMENT RELAY – COMMUNICATIONS GUIDE
CHAPTER 3: MODBUS FUNCTIONS
Description
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