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C
Modbus
™
RTU Communications Protocol
SIMPRO-100
162
PRIM-2400C
C.5
03h Read Holding
Registers Command
Use function code 03h to read directly from the
Modbus Register map shown in Table C.19 on
page 187. You may read a maximum of 125
registers at once with this function code. Most
masters use 4X references with this function
code. If you are accustomed to 4X references
with this function code, for 5-digit addressing, add
40001 to the standard database address.
Table C.6
03h Read Holding Registers Command
C.6
04h Read Input
Registers Command
Use function code 04h to read from the Modbus
map shown in Table C.19 on page 187. You may
read a maximum of 125 registers at once with this
function code.
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 (03h)
2 bytes Starting register address
2 bytes Number of registers to read
2 bytes CRC-16 for message
A Successful SIMPRO-100 Relay Response will
have the Following Format
1 byte Slave address
1 byte Function code (03h)
1 byte
Byte count (should be twice the number of
registers read)
n bytes Byte count bytes of data
2 bytes CRC-16 for message
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 SIMPRO-100 Relay Response will
have the Following Format
1 byte Slave address
1 byte Function code (04h)
1 byte Byte count (should be twice the number of
registers read)
n bytes Byte count bytes of data
2 bytes CRC-16 for message
Summary of Contents for SIMPRO-100
Page 1: ...SIMPRO 100 Motor Protection Relay Instruction Manual Document No PRIM 2400C ...
Page 12: ...Contents SIMPRO 100 x PRIM 2400C ...
Page 16: ...Contents SIMPRO 100 xiv PRIM 2400C ...
Page 42: ...3 SIMPRO PC Software SIMPRO 100 40 PRIM 2400C ...
Page 100: ...6 ASCII Serial Port Operation SIMPRO 100 98 PRIM 2400C ...
Page 127: ...SIMPRO 100 Event Analysis 9 PRIM 2400C 125 Figure 9 2 Example SER Report ...
Page 136: ...10 Maintenance Troubleshooting SIMPRO 100 134 PRIM 2400C ...
Page 138: ...A Firmware Versions SIMPRO 100 136 PRIM 2400C ...
Page 206: ...D SIMPRO PC Compatibility Features SIMPRO 100 204 PRIM 2400C ...
Page 214: ...E Motor Thermal Element SIMPRO 100 212 PRIM 2400C ...
Page 230: ...F SIMPRO 100 Relay Settings Sheets SIMPRO 100 228 PRIM 2400C ...
Page 239: ......