Modbus protokoll rs485: Difference between revisions

Revision as of 22:38, 2 December 2019

Modbus Rtu 2

Hardware Resources:

 *   RS485 communication interface
 *   TTL communication interface
 *   2 optocoupler isolation input
 *   2 way optocoupler isolation 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)

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 to: 09

Hex Byte	Funktion
01 10 00 00 00 01 02 00 09 66 56	Current address 01 is changed to 09
00 10 00 00 00 01 02 00 09 6B C6	Broadcast Address Modified to 09

Read Address
00 03 00 00 00 01 85 db

Return:
00 03 02 00 01 44 44 // 01 for Address

/***************************************************************************************/
Meaning of each byte:
[address 1]

No. 1 relay is on : 01 05 00 01 01 00 9d 9a

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

/***************************************************************************************/
[Mod Bus Address 1]

0 relay ON: 01 05 00 00 FF 00 8C 3A
0 relay off: 01 05 00 00 00 00 CD CA

No. 1 relay ON: 01 05 00 01 FF 00 DD FA
No. 1 relay off: 01 05 00 01 00 00 9C 0A

No. 2 relay ON: 01 05 00 02 FF 00 2D FA
No. 2 relay off: 01 05 00 02 00 00 6C 0A

/******************************************** 01 10 00 00 00 01 02 00 09 66 56 // Current address 01 is changed to 09
00 10 00 00 00 01 02 00 09 6B C6 // Broadcast Address Modified to 09
******************************************* /
off: 01 0F 00 00 00 08 01 00 FE 95
all bright: 01 0F 00 00 00 08 01 FF BE D5
/*************************************************************************************** /

Read all relay states:

Send: 01 01 00 00 00 08 3D CC

Return: 01 01 01 00 51 88 Relay fully closed

Return: 01 01 01 03 11 89 All relays are on

/*************************************************************************************** /
Read all input switch status
Send: 01 02 00 00 00 08 79 CC Read 8 input states
Return: 01 02 01 00 A1 88

Modbus Rtu 4

Specifications:

 *   RS485 communication interface
 *   TTL communication interface
 *   4 optocoupler isolation input
 *   4 way optocoupler isolation output
 *   A user button
 *   A user LED
 *   A power indicator
 *   A STM32F030F4 microcontroller
 *   4 relay status indicators LED lights
 *   Power supply terminal interface (12V power supply)

Modbus RTU command

Baud Rate: 9600 8 NONE 1

/ *************************************************************************************** /
Setting address is: 01
00 06 40 00 00 01 5c 1b
Setting address is: 02
00 06 40 00 00 02 1c 1a
Read address
00 03 40 00 00 01 90 1b
/ *************************************************************************************** /
Read the software version
00 03 00 04 00 01 c4 1a // [month] broadcast read (only by one device to address all practical, easy to test)
0,003,000,800,010,419 [years] // broadcast read (only by one device to address all practical, easy to test)
00 03 00 10 00 01 84 1e [when] // sub broadcast read (only by one device to address all practical, easy to test)

Read the hardware version (PCB version)
0,003,002,000,018,411 // broadcast read (only by one device to address all practical, easy to test)
/ *************************************************************************************** /
[1 Address]

Open relay 1
01 05 00 01 01 00 9d 9a
Relay 1 closed
01 05 00 01 00 00 9c 0a

No. 2 relay open
01 05 00 02 01 00 6d 9a
No. 2 relay closed
01 05 00 02 00 00 6c 0a

3 relay open
01 05 00 03 01 00 3c 5a
3 Relay Off
01 05 00 03 00 00 3d ca

No. 4 relay open
01 05 00 04 01 00 8d 9b
4 Relay Off
01 05 00 04 00 00 8c 0b
Quanmie
01 05 00 ff 00 00 fd fa
All light
01 05 00 ff ff ff fc 4a

[2 Address]
Open relay 1
02 05 00 01 01 00 9d a9
Relay 1 closed
02 05 00 01 00 00 9c 39

No. 2 relay open
02 05 00 02 01 00 6d a9
No. 2 relay closed
02 05 00 02 00 00 6c 39

3 relay open
02 05 00 03 01 00 3c 69
3 Relay Off
02 05 00 03 00 00 3d f9

No. 4 relay open
02 05 00 04 01 00 8d a8
4 Relay Off
02 05 00 04 00 00 8c 38
Quanmie
02 05 00 ff 00 00 fd c9
All light
02 05 00 ff ff ff fc 79
/ *************************************************************************************** /
No. 1 relay 1 channel status
01 01 00 01 00 04 6c 09

No. 1 Relay 2 channel status
01 01 00 02 00 04 9c 09

Relay 1 3 Channel status
01 01 00 03 00 04 CD C9

4 channel relay 1 status
01 01 00 04 00 04 7C 08
/ *************************************************************************************** /
Read the status of all input interfaces
01 02 00 00 00 00 78 0a

@@ Line 27: / Line 27: @@
 <br>
 /***************************************************************************************/ <br>
-Set the address to: 09<br>
+Set the address to: 09
-10 00 00 00 01 02 00 09 66 56            // Current address 01 is changed to 09<br>
-10 00 00 00 01 02 00 09 6B C6            // Broadcast Address Modified to 09<br>
+{| class="wikitable"
+|-
+! Hex Byte  !! Funktion
+|-
+| 01 10 00 00 00 01 02 00 09 66 56  || Current address 01 is changed to 09
+|-
+| 00 10 00 00 00 01 02 00 09 6B C6  || Broadcast Address Modified to 09
+|}
 <br>
 Read Address<br>
@@ Line 62: / Line 69: @@
 No. 2 relay off:  01 05 00 02 00 00 6C 0A <br>
 <br>
-/*************************************************************************************** / <br>
+/********************************************
+10 00 00 00 01 02 00 09 66 56            // Current address 01 is changed to 09<br>
+10 00 00 00 01 02 00 09 6B C6            // Broadcast Address Modified to 09<br>******************************************* / <br>
 off:              01 0F 00 00 00 08 01 00 FE 95 <br>
 all bright:       01 0F 00 00 00 08 01 FF BE D5 <br>