GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual page 176

7.3 MODBUS FUNCTIONS
c) FUNCTION CODE 05H: EXECUTE OPERATION
Modbus implementation:
GE Multilin implementation:
This function code allows the master to perform various operations in the 745. The 2 byte Code Value of FF00h must be
sent after the Operation Code for the operation to be performed.
MESSAGE FORMAT AND EXAMPLE:
Request to perform reset operation in slave device 11.
MASTER QUERY MESSAGE:
SLAVE ADDRESS
FUNCTION CODE
OPERATION CODE: high order byte, low order byte
CODE VALUE: high order byte, low order byte
CRC: low order byte, high order byte
SLAVE RESPONSE:
SLAVE ADDRESS
FUNCTION CODE
OPERATION CODE: high order byte, low order byte
CODE VALUE: high order byte, low order byte
CRC: low order byte, high order byte
Table 7–2: SUMMARY OF OPERATION CODES FOR FUNCTION CODE 05H
OPERATION DEFINITION
CODE
0000 NO OPERATION
0001 REMOTE RESET
0002 TRIGGER TRACE
MEMORY
0003 CLEAR MAXIMUM
DEMAND DATA
0004 CLEAR EVENT
RECORDER DATA
0005 CLEAR LOSS-OF-LIFE
7
DATA
0006 CLEAR TRACE
MEMORY
0007 CLEAR ENERGY DATA
7-6
Courtesy of NationalSwitchgear.com
Force Single Coil
Execute Operation
EXAMPLE (HEX):
11 query message for slave 11
05 execute operation
00 01 remote reset
FF 00 perform operation
DF 6A computed cyclic redundancy check
EXAMPLE (HEX):
11 response message from slave 11
05 execute operation
00 01 remote reset
FF 00 perform operation
DF 6A computed cyclic redundancy check
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 command in message
DEMAND DATA CLEAR CLEAR MAX DEMAND DATA
Performs the same function as the command in message
EVENT DATA CLEAR CLEAR EVENT RECORDER DATA
Performs the same function as the command in message
INSTALLATION CLEAR LOSS-OF-LIFE DATA
Clears all trace memory buffers and sets the "Total Number of Trace Triggers" register to
zero.
Performs the same function as the command in message
ENERGY DATA CLEAR CLEAR ENERGY
745 Transformer Management Relay
7 COMMUNICATIONS
A2 METERING
.
A3 EVENT RECORDER
.
S1 745 SETUP
.
A2 METERING
.
DEMAND
ENERGY
GE Multilin