Request
Function Code 1 Byte 0x03
Starting Address 2 Bytes
0x0000-0xFFFF (see 23 Modbus Parameter
Table)
Quantity of Reg-
isters
2 Bytes Two 32-bit values or four 64-bit values
Normal Response
Function
Code
1 Byte 0x03
Byte Count 1 Byte 2 x N*
Register
Value
N* x 2 Bytes Data
*N = Quantity of Registers
Error Response
Function Code 1 Byte 0x83
Exception
Code
1 Byte
See Exception Response
Codes
Following is an example of reading the position loop feedback PL.FB at index 588 (0x024C), with an actual value
of 0x1 2A05 F200.
Request
Function 03
Starting Address Hi 02
Starting Address Lo 4C
Quantity of Registers Hi 00
Quantity of Registers
Lo
04
Response
Function 03
Byte Count 08
Register 588 Hi 00
Register 588 Lo 00
Register 589 Hi 00
Register 589 Lo 01
Register 590 Hi 2A
Register 590 Lo 05
Register 591 Hi F2
Register 591 Lo 00
AKD User Guide | 22 Modbus
Kollmorgen | December 2010 71
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