G.28
SEL-551 Relay Instruction Manual Date Code 20110408
Modbus RTU Communications Protocol
Modbus RTU Communications Protocol
NOTE 4: The Modbus map (Table G.18) provides a feature that allows you to
download complete event data via Modbus. See Table G.1 7 for data
descriptions.
NOTE 5: Please refer to Table G.16 for a list of Command Codes.
General Comments
All registers are 16 bits with bit locations ranging from 0 to 15.
Relay words and targets are mapped in bit positions 8–15 in the register.
Contact status is mapped in bit positions 7–15 in the register. The 0 bit
position of this register is set equal to 1 if any of the 1–15 positions are
set to 1.
TRIG ER2
TRIP PULSE
ERI
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