Modbus Rtu communication protocol - Solutions - Huaqiang Electronic Network

SMD Aluminum Electrolytic Capacitor
AVX TPSE226M035R0125 Low Impedance Tantalum Capacitor, 22µF
Electronic Scale Crystal Oscillator, 3.2x2.5mm, 3225, 16MHz (16.000MHZ), 12PF, 10PPM, 20PPM, 30PPM
Huaqiang Square Crystal Original Stock

1. Reading Holding Registers (Single or Multiple, in Words as the Smallest Unit):

Device Address Function Code Address H Address L Data Amount H Data Amount L CRC H CRC L 03 HHoldStart DataNum CRC high CRC low

Frame Length: 8 bytes

Device Address: 1~247

Function Code: 03H

Data Address: 0~65535

Data Quantity: 1~65535

CRC Check: CRC16

Return Command Frame:

Device Address Function Code Data Volume Data 1 Data N CRC H CRC L 13 H Bytes of Return Data NData (1~N) CRC high CRC low

Frame Length: 5 + N bytes

Device Address: 1~247

Function Code: 03H

Data Volume: Actual data read

Return Data Meaning:

a = HoldStart, n = DataNum - 1

VW a (VB a) VW a (VB a+1) ... VW a+n (VB a+n) Data(1) Data(2)...Data(N-1) Data(N)

CRC Check: CRC16

Command Error:

  • No response
  • Invalid frame returned
Device Address Function Code Error Message CRC H CRC L 18 3 H One byte error message CRC high CRC low

2. Writing to Holding Registers (Multiple, in Words as the Smallest Unit):

Device Address Function Code Address H Address L Data Amount H Data Amount L Byte Number Specific Data CRC H CRC L 01 0 H HoldStart DataNum bytN ~ bytN CRC high CRC low

Frame Length: 9 + bytN bytes

Device Address: 1~247

Function Code: 10H

Data Address: 0~65535

Data Quantity: 1~122

Bytes: bytN = DataNum × 2

Data: Specific byte data

CRC Check: CRC16

Return Command Frame:

Device Address Function Code Address H Address L Data Amount H Data Amount L CRC H CRC L 11 0 H HoldStart DataNum CRC high CRC low

Frame Length: 8 bytes

Device Address: 1~247

Function Code: 10H

Data Address: 0~65535

Data Quantity: 1~122

CRC Check: CRC16

Command Error:

  • No response
  • Invalid frame returned
Device Address Function Code Error Message CRC H CRC L 19 0 H One byte error message CRC high CRC low

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