Modbus protokoll rs485

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Modbus Funktions Codes

Hex Data Funktion
adr fc data .....
.. 01 .. .. .. Lese Ausgangsbit Status
.. 02 .. .. .. Lese Eingangsbit Status
.. 03 .. .. .. Lese Holding-Register Analog Ausgang
.. 04 .. .. .. Lese Input-Register Analog Eingang
.. 05 .. .. .. Schreibe Ausgangsbit
.. 06 .. .. .. Schreibe Holding-Register Analog Ausgang
.. 0F .. .. .. * Funktion noch offen
.. 10 .. .. .. wird bei den China Modulen zum Anpassen der UID benutzt
.. 15 .. .. .. Schreibe mehrfach Ausgangsbit
.. 16 .. .. .. Schreibe mehrfach Holding-Register (Daten für >16-bit) Analog Ausgang
.. 23 .. .. .. * Funktion noch offen
  • das sind wohl noch nicht alle Modbus Funktion Codes

es gibt wohl auch Sonderfunktionen die nur bei bstimmten Geräten vorhanden sind hier z.B. 0x10h setzten der UID



adr -> device Adress oder auch UID - 1 Byte lang
fc -> Function Code 1 Byte
data -> n Bytes

Modbus RTU Instructions:

Baud rate: 9600 8 NONE 1

Hexadecimal send
hexadecimal receive

Operation steps:
1. Software settings communication baud rate
2. Set the address (communication using the device address, the default address is 01)

Set the address from from Broadcast to 0x01 , 0x02 , 0x03

Hex Byte Funktion
00 10 00 00 00 01 02 00 01 6A 00 Broadcast Address Modified to 01
00 10 00 00 00 01 02 00 02 2A 01 Broadcast Address Modified to 02
00 10 00 00 00 01 02 00 03 EB C1 Broadcast Address Modified to 03


Read Address at Broadcast Call

Hex Byte Funktion
00 03 00 00 00 01 85 db Send to Device ( Broadcast )
00 03 02 00 01 44 44 Receive from Device 01 for Address
00 03 02 00 02 04 45 Receive from Device 02 for Address
00 03 02 00 03 C5 85 Receive from Device 03 for Address


Modbus Rtu 2

Hardware Resources: Data register address 

 *   RS485 communication interface
 *   TTL communication interface
 *   2 Input ( max. DC +12 Volt UB ) 
 *   2 Relay Output 
 *   A user button
 *   A user LED
 *   A power indicator
 *   A STM32F030F4 microcontroller
 *   2 relay status indicators LED lights
 *   Power supply terminal interface (12V power supply)


Meaning of each byte:

Byte 1: address
byte 2: function
byte 3 4: register address
byte 5 6: register data
byte 7 8: CRC check


[address 1 bzw. UID 0x01]

Switch Single

Hex Data Funktion
Adresse Funktion Reghigh Reglow Data 1 Data 2 CRChigh CRClow Funktion
01 05 00 00 FF 00 8C 3A 0 relay ON
01 05 00 00 00 00 CD CA 0 relay off
01 05 00 01 FF 00 DD FA 1 relay ON
01 05 00 01 00 00 9C 0A 1 relay off


all Funktion

Hex Data Funktion
Adresse Funktion Reghigh Reglow Data 1 Data 2 Data 3 Data 4 CRChigh CRClow Funktion
01 0F 00 00 00 08 01 00 FE 95 Full Relay off
01 0F 00 00 00 08 01 FF BE D5 Full Relay on
01 02 00 00 00 08 79 CC Send : Read all input switch status
01 02 01 00 A1 88 Return : 8 input states

Quelle - https://hacktronics.co.in/2-channel-relay-module/modbus-rtu-2-way-relay-output-2-way-input-switch-ttl-rs485-interface-communication



Modbus Rtu 4

Specifications: 

 *   RS485 communication interface
 *   TTL communication interface
 *   4 Input ( Switch to GND !!!! NO + UB !!! )
 *   4 Relay Output 
 *   2 user button
 *   A user LED
 *   A power indicator
 *   A STM32F030F4 microcontroller
 *   4 relay status indicators LED lights
 *   Power supply terminal interface (12V power supply)


[address 1 bzw. UID 0x01]

Switch Single

Hex Data Funktion
Adresse Funktion Reghigh Reglow Data 1 Data 2 CRChigh CRClow Funktion
01 05 00 00 FF 00 8C 3A 0 relay ON
01 05 00 00 00 00 CD CA 0 relay off
01 05 00 01 FF 00 DD FA 1 relay ON
01 05 00 01 00 00 9C 0A 1 relay off
01 05 00 02 FF 00 xx xx 2 relay ON
01 05 00 02 00 00 xx xx 2 relay off
01 05 00 03 FF 00 xx xx 3 relay ON
01 05 00 03 00 00 xx xx 3 relay off


all Funktion

Hex Data Funktion
Adresse Funktion Reghigh Reglow Data 1 Data 2 Data 3 Data 4 CRChigh CRClow Funktion
01 0F 00 00 00 08 01 00 FE 95 Full Relay off
01 0F 00 00 00 08 01 FF BE D5 Full Relay on
01 02 00 00 00 08 79 CC Send : Read all input switch status
01 02 01 00 A1 88 Return : 8 input states


hacktronics.co.in/4-channel-relay-module
github Board-C0135

Modbus_RTU_4_Way_Relay_Module.pdf

DDS578R Energy Meter

MODBUS-RTU communication protocol Description:

1.the data format:
Address + function code + data + CRC check code

2.the register type
This meter uses two types of registers, individually addressed
The first is the data register, read-only, using the command code 0x04 to read.
The second category is the parameter register, readable and writable, using the command code 0x03
read, write parameters using 0x10

3.the data format
Float type data: Read the internal data within the meter in line with IEEE-754 standardv floating-point number, data format is 32-bit 4-byte single-precision floating-point data format.

4、Data register list

Data register address Register Description
adr fc highByte lowByte Description unit Format Mode
xx 03 00 00 A phase voltage V Floating point Read-only
xx 03 00 02 B phase voltage V Floating point Read-only
xx 03 00 04 C phase voltage V Floating point Read-only
xx 03 00 08 A line current A Floating point Read-only
xx 03 00 0A B line current A Floating point Read-only
xx 03 00 0C C line current A Floating point Read-only
xx 03 00 10 Total active power KWh Floating point Read-only
xx 03 00 12 A phase active power KWh Floating point Read-only
xx 03 00 14 B phase active power KWh Floating point Read-only
xx 03 00 16 C phase active power KWh Floating point Read-only
xx 03 00 18 Total reactive power KWh Floating point Read-only
xx 03 00 1A A phase reactive power Var Floating point Read-only
xx 03 00 1C B phase areactive power Var Floating point Read-only
xx 03 00 1E C phase reactive power Var Floating point Read-only
xx 03 00 2A A phase power factor Floating point Read-only
xx 03 00 2E B phase power factor Floating point Read-only
xx 03 00 2C C phase power factor Floating point Read-only
xx 03 00 36 frequency frequency Floating point Read-only
xx 03 01 00 Total active electricity power KWh Floating point Read-only
xx 03 04 00 Total reactive electricity power KWh Floating point Read-only


The second category register (parameter register) read and operate read the meter Address:

(HEX):01 03 00 08 00 02 45 C9

Date descriptions

Data Detailed description
0x01 Instrument address ( adr )
0x03 Function code, read parameter register ( fc )
0x00 0x08 reading the data from the 00 08 meter internal register address
0x00 0x02 Read data length for two words( four bytes )of data
0x45 0xC9 CRC checksum data for the front, where the high front and low in the post

Returns Data (HEX) 01 04 03 40 00 00 00 EF F3

Data Detailed description
0x01 Instrument address
0x03 Function code, read parameter register
0x04 Returned data length is 4 bytes of data length
0x40 0x00 0x00 0x00 TUSB To RS485 Converterhe data returned as a 4-byte data type float
0xEF 0xF3 CRC checksum data for the front, where the high front and low in the post




USB To RS485 Converter


USB-To-RS485-Converter

ll /sys/class/tty/*/device/driver
lrwxrwxrwx 1 root root 0 Dez 21 19:30 /sys/class/tty/ttyUSB0/device/driver -> ../../../../../../../../bus/usb-serial/drivers/pl2303/

lsusb
Bus 003 Device 014: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port


https://developer.toradex.com/knowledge-base/uart-(linux)

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This page was last edited on 25 January 2020, at 13:45.
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