1–176
345 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
MODBUS FUNCTIONS
CHAPTER 1: COMMUNICATIONS GUIDE
FUNCTION CODE: 1 byte (with MSbit set to 1)
EXCEPTION CODE: 1 byte
CRC: 2 bytes
The 345 implements the following exception response codes:
01 - ILLEGAL FUNCTION
The function code transmitted is not one of the functions
supported by the 345.
02 - ILLEGAL DATA ADDRESS
The address referenced in the data field transmitted by the
master is not an allowable address for the 345.
03 - ILLEGAL DATA VALUE
The value referenced in the data field transmitted by the
master is not within range for the selected data address.
Force coil commands
Modbus Address
Hex Address
Description
1
Reset
4
Open
5
Close
6
Display Message
7
Activate Group 1
8
Activate Group 2
11
Active Group
96
Clear Last Trip Data Prompt
99
Clear Trip Counters
100
Clear Event Records
101
Clear Waveform Data
102
Clear Maintenance Timer
104
Clear Temperature History
105
Clear Thermal Image
120
Trigger Waveform Capture
127
Start Uploading Setpoint File
128
End Uploading Setpoint File
4096
Force Virtual Input 1 State
4097
Force Virtual Input 2 State
4098
Force Virtual Input 3 State
4099
Force Virtual Input 4 State
4100
Force Virtual Input 5 State
4101
Force Virtual Input 6 State
4102
Force Virtual Input 7 State
4103
Force Virtual Input 8 State
4104
Force Virtual Input 9 State
4105
Force Virtual Input 10 State
4106
Force Virtual Input 11 State
4107
Force Virtual Input 12 State
4108
Force Virtual Input 13 State