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APPENDIX C: MODBUS PROTOCOL SERIAL COMMANDS

MODBUS FUNCTION CODES

03 (0x03) Read Holding Registers

This function code is used to read the contents of a contiguous block of holding registers in a

remotedevice.TheRequestspeciesthestartingregisteraddressandthenumberofregisters.

The registers are addressed starting at zero. Therefore registers numbered 1-16 are addressed as

0-15. The register data in the response message are packed as two bytes per register, with the

binarycontentsrightjustiedwithineachbyte.Foreachregister,therstbytecontainsthehigh

order bits and the second contains the low order bits.

Request

Function code: (1 Byte) 0x03

Starting Address: (2 Bytes) 0x0000 to 0xFFFF

Quantity of Registers: (2 Bytes) 1 to 125 (0x7D)

Response

Function code: (1 Byte) 0x03

Byte count: (1 Byte) 2 x N*

*N=QuantityofRegisters

Error

Error code: (1 Byte) 0x83

Exception code: (1 Byte) 01, 02, 03, or 04

16 (0x10) Write Multiple registers

This function code is used to write a block of contiguous registers (1 to approx. 120 registers)

inaremotedevice.Therequestedwrittenvaluesarespeciedintherequestdataeld.Datais

packed as two bytes per register. The normal response returns the function code, starting

address, and quantity of registers written.

Request

Function code: (1 Byte) 0x10

Starting Address: (2 Bytes) 0x0000 to 0xFFFF

Quantity of Registers: (2 Bytes) 0x0001 to 0x007B

Byte Count: (1 Byte) 2 x N*

Registers Value: (N* x 2 Bytes value)

*N=QuantityofRegisters

Response

Function code: (1 Byte) 0x10

Starting Address: (2 Bytes) 0x0000 to 0xFFFF

Quantity of Registers: (2 Bytes) 1 to 123 (0x7B)

C-3

1 2 ... 51 52 53 54 55 56 57 58 59 60 61 ... 75 76

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Kistler-morse KM STXPlus Manuel d'utilisateur Page 56