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CLRS Series RS485 Closed Loop Stepper Drive User Manual
4.2.1 Read Holding Registers FC= 03
Example A: Read the value of a single register--peak current
Send message: 01 03 01 91 00 01 D3 1B
Receive message: 01 03 02 00 0A 38 43
Details as following: Master->slave data:
Slave->master data:
Message: 01 03 02 00 0A 38 43
Description:
Slave ID FC Number of bytes returned Value of 0x01 91 CRC
Note: 0x0191-- output peak current, 000A(Hexadecimal)=10(decimal, unit: 0.1A), it means the current 1A.
Example B: Read multiple register values
Send message: 01 03 01 BC 00 06 05 D0
Receive message: 01 03 0C 00 00 00 02 00 00 00 01 00 00 00 04 B6 13
Details as following: Master->slave data:
Message 01 03 01 BC 00 06 05 D0
Description Slave ID FC Register address Number of registers read CRC
Slave>master data:
Message 01 03 0C 00 00 00 02 00 00 00 01 00 00 00 04
9D
B3
Description Slave
ID
FC
Number of
bytes
returned
Value of
0x01BC
Address
0x01BD
Value of
0x01BE
Value of
0x01BF
Value of
0x01C0
Value of
0x01C1 CRC
Read Holding Registers Query (Master to
Slave)
Read Holding Registers Response (Slave to Master)
Slave ID 00 - 1F Slaver ID 00 - 1F
FC 03 FC 03
Address of beginning register
to be read
High
Number of data bytes in
message
High
Low Low
Total number of registers to
be read
High Data from registers (2 bytes
per register)
High
Low Low
CRC
Low
CRC
Low
High High
Message: 01 03 01 91 00 01 D3 1B
Description: Slave ID FC Register address
Number of registers
read
CRC