701 Motor Protection Relay
Date Code 20010719
Modbus
®
RTU Communications Protocol
04h Read Input Registers Command
C.8
04h Read Input Registers Command
Use function code 04h to read from the Modbus map shown in
. You may read a maximum of 125 registers at once with this function code.
Table C.7
04h Read Input Registers Command
Table C.7
04h Read Input Registers Command
Bytes
Field
The Master Request Must Have the Following Format
1 byte
Slave address
1 byte
Function code (04h)
2 bytes
Starting register address
2 bytes
Number of registers to read
2 bytes
CRC-16 for message
A Successful SEL-701 Relay Response Will Have the Following Format
1 byte
Slave address
1 byte
Function code (04h)
1 byte
Byte count (should be twice number of registers read)
n bytes
Byte count bytes of data
2 bytes
CRC-16 for message
Содержание SEL-701
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