GE 345 Communications Manual

CHAPTER 1: COMMUNICATIONS GUIDE ETHERNET INTERFACE
345 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE 1–35
Response:
43H Write Settings Group
Not a standard function
This function is used to write settings in a specific settings group.
Example: (In the example there is a write setting procedure in the Group 1 (00) , setting
address 0x09C1 and 2 bytes of data with value 0x0001.)
Response:
Exception and error
responses
One data frame of an asynchronous transmission to or from a 345 typically consists of 1
start bit, 8 data bits, and 1 stop bit. This produces a 10 bit data frame. This is important for
transmission through modems at high bit rates.
Modbus protocol can be implemented at any standard communication speed. The
SR350supports operation at 9600, 19200, 38400, 57600, and 115200 baud.
Request response
sequence
A complete request/response sequence consists of the following bytes (transmitted as
separate data frames):
Master Request Transmission:
SLAVE ADDRESS: 1 byte
FUNCTION CODE: 1 byte
DATA: variable number of bytes depending on FUNCTION CODE
Field Name Hex
Slave Address FE
Function 42
Byte Count 02
Data Hi 00
Data Lo 00
Field Name Hex
Slave Address FE
Function 43
Group Activation 00
Starting Address Hi 09
Starting Address Lo C1
No. of Registers Hi 00
No. of Registers Lo 01
Byte Count 04 02
Data Hi 00
Data Lo 01
Field Name Hex
Slave Address FE
Function 43
Starting Address Hi 09
Starting Address Lo C1
No. of Registers Hi 00
No. of Registers Lo 01

GE 345 Specifications

General

Brand	GE
Model	345
Category	Relays
Language	English