Arduino Microcontroller TTL C++ Code (Master / Slave Communication)

The purpose of this code is to be able to send a command through Arduino C++ code to a slave device over Serial1 then have the master read back the returned values from the slave whenever it sends out a query (for further processing outside the scope of this project) but it should also optionally be able to display the Tx and Rx commands over Serial so it can be reviewed through the Arduino Serial Monitor. Note that the data is ultimately being sent through a RS485 device but that hardware is responsible for taking the TTL serial output and converting it both ways (so this code does not need to handle that). The Tx and Rx data will always be in the format of a single message is sent (Tx) and a single message is returned back (Rx).

To send and receive a command, here is an example of working code. You do not need to use this exact method but it does show the message being sent and has been tested working.

byte message [] = {0x01, 0x01, 0x09, 0x02, 0x00, 0x02, 0x02, 0x02, 0x20, 0x0B, 0x20, 0x00, 0x04};

[login to view URL](message, sizeof(message));

Which will send (Tx) the hex digits 01 01 09 02 00 02 02 02 20 0B 20 00 04.

Please see the attachment for a visual example of the message format.

The first value, 0x01 represents the Start Header.

The fourth value, 0x02 represents the Start Data 0.

The final value, 0x04 represents the Checksum.

Those values and their location will never change in a Tx (or Rx for that matter) message.

The second value, 0x01 represents the slave ID that this is being sent to. That will change but if the master is sending a command to 0x01, only 0x01 will respond and that value will always be 0x01 in that case. The 0x02 slave will never respond to a message sent to the 0x01 slave for example.

Assuming the 0x01 slave unit is in a good operational state, the slave with an ID of 01 will respond (Rx) to the above message with:

01 01 0C 02 00 00 00 37 28 A2 08 5A 9D 24 00 04

Please see the attached image for a further breakdown of what this Rx message means.

#1, 01 represents the Start Header.

#2, 01 represents the slave ID.

#3, 09 represents the lenght (in hex) so 9 in this case, a total length of 13 because no CRC and the Start Header, the ID, the Length and the End Telegram are not counted here.

#4, 02 always indicates that this is Start Data 0.

#5, 00 Motion Control Sub ID - This is where the actual message starts and will differ often. This is sub ID (00 in this case)

#6, 02 Motion Control Main ID - this represents Write Motion Control Interface but that doesn't matter too much here except to represent the next value, the count, which needs to differ slightly from message to message.

#7, 02 this is the count, which needs to change each time a Write Motion Control Tx message is sent (it can go from 01 to 02 and back to 01 or it can go from 01 to 02 and continue to 0F before wrapping back to 01 but when using the Write Motion Control Interface as selected by sending 00 #8, 02 above, the count needs to be different with each Tx that sends a Write Motion Control message.

#9, 02 This is the Motion Cmd Intf Header High Byte Master ID =2 and can stay 02.

#10, 20 Target position movement lowest byte

#11, 0B Target position movement middle low byte

#12, 20 Target position movement middle high byte

#13, 00 Target position movement highest byte - so this and the prior 3 values (20 0B 20 00) represent this message telling the slave to move to the following location that is mapped to those 4 values. In this case, it maps out to 0x200B20, the desired value.

#14, 04 is the End Telegram and will always be the last value of a Tx or Rx message even if a checksum is used.

In this case, the purpose of this message is to send a command to the 01 slave to move to the 0x200B20 position. The slave responds and indicates it has received the command, has heard it and reiterates what it is doing (where it is now going to) and what state it is currently in.

Please review the complete requirements file (attached).

Kemahiran: Arduino, Pengaturcaraan C++, Elektronik, Perisian Terbenam, Mikropengawal

Lihat lagi: code assembly serial communication 8088, mcu master rs485 communication, source code master page template, arduino to arduino serial communication code, arduino serial communication between arduinos, arduino uno protocols, arduino communication protocols pdf, two arduino uno serial communication, arduino parallel communication, arduino serial packet protocol, arduino communication types, arduino microcontroller machine code, arduino microcontroller code, arduino code to c code converter, pic serial communication c code, uart serial communication c code, c# code to download pdf file, bluetooth master slave arduino

Tentang Majikan:
( 22 ulasan ) Mebane, United States

ID Projek: #19787798

Dianugerahkan kepada:


Hello sir, I can make you a master / slave program in C ++ to meet all your requirements. And can set the setting via serial terminal (eg. CRC type). Please send me a message to discuss more detail about the project Lagi

$100 USD dalam 2 hari
(6 Ulasan)

14 pekerja bebas membida secara purata $246 untuk pekerjaan ini


Dear sir I have more than 10 years experience in embedded systems design, I can do the required Master/Slave protocol, please message me so that we can discuss more details Best regards

$120 USD dalam 3 hari
(215 Ulasan)

Dear Client. Thanks for proposal on this posting. I am very interested in your project. You can see fully about it in my profile and portfolios. I have many experiences on developing of Arduino program. I have also Ard Lagi

$350 USD dalam 7 hari
(44 Ulasan)

I have long experience with 8-bit , 16-bit and 32-bit micro-controllers. I work with Microchip (PIC) , Atmel (AVR , SAM) , ST (STM) , TI (MSP) , Nordic (nRF52), and NXP (LPC) micro-controllers. I use KEIL IDE , Atmel S Lagi

$250 USD dalam 3 hari
(36 Ulasan)

hi we have excellent experience in modbus "rtu,tcp" ,arduino and embedded programming. so we can do this , for 750$ it is higher you bid limit but our options is: - we have all hardware parts which needs to this proj Lagi

$750 USD dalam 20 hari
(12 Ulasan)

Hello, My name is Andrei, i am a Romanian IOT Developer with a lot of experience in IOT projects and automatics . I see that as a library for Mod bus implementation , i have made slave master communication before Lagi

$200 USD dalam 7 hari
(17 Ulasan)

I am specialist in development and interfacing between Android application and arduino board. hardware designing for embedded hardware. software development for embedded hardware. Home automation. Controlling hardware Lagi

$333 USD dalam 5 hari
(6 Ulasan)

I DO NOT OUTSOURCE I have been a freelancer for the past 8 years, I believe that my experience and skill in this background will prove to be of great help to you. Contact me to discuss more on the details

$200 USD dalam 3 hari
(3 Ulasan)

Hello, I have read the details provided and i am positive i can provide quality work,please contact me to discuss more on the project deadline and some other few things

$150 USD dalam 5 hari
(9 Ulasan)

Hello I'm an embedded software engineer and I would like to hear about your project requirements to estimate how much effort is needed to complete the job. so I can adjust my bid to job complexity. Best regards

$250 USD dalam 10 hari
(1 Ulasan)

Great.... We are embedded developers in Bangalore... We can do the task in one day... I have gone through the files and got the idea... My team is ready to begin, if confirmed... Waiting... More information in th Lagi

$150 USD dalam 3 hari
(1 Ulasan)

Hi I'm a Computer Engineer and have studied your document attach to the task I will like to code your project as I have a experience in arduino Coding and implementation of different hardware. I had done task like cont Lagi

$140 USD dalam 7 hari
(0 Ulasan)

I can help you in this project. I have 8 years of C++ coding experience. I have worked many projects based on arduino. I have been working on multiple robotics related projects which include C++ programming

$250 USD dalam 3 hari
(0 Ulasan)

Dear Sir, We are experts in the byte stream encoding and decoding skill. Currently we were working on United States Repligen Corporation's systems which does a similar thing. They had provided us a protocol documentat Lagi

$200 USD dalam 15 hari
(0 Ulasan)