ArduinoModbus
By arduino-libraries
ArduinoRS485
By arduino-libraries
| ArduinoModbus | ArduinoRS485 | |
|---|---|---|
| 2 | 1 | |
| 237 | 80 | |
| 0.8% | - | |
| 6.1 | 6.5 | |
| about 1 month ago | 29 days ago | |
| C++ | C++ | |
| - | GNU Lesser General Public License v3.0 only |
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
ArduinoModbus
Posts with mentions or reviews of ArduinoModbus.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2023-03-03.
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Arduino Uno as Modbus RTU Slave with MKR 485 Shield - Not Communicating with PC - Please Help ;
Question: Can anyone assist me figure out the wiring between an Arduino Uno and MKR 485 Shield, and the shield and my PC? All related links are at the bottom of the post. Background: I am trying to use an Uno as a Modbus Slave, and cannot get my PC to read the holding registers (40001-40005). The code generates the registers and writes the values 1-5 to the corresponding holding registers which are printed to the serial monitor as shown below: IDE Screen Capture #include // ArduinoModbus depends on the ArduinoRS485 library #include long holdingRegisterArray[] = {0,0,0,0,0}; // initialize 5 long array for holding registers void setup() { // start the Modbus RTU server, with (slave) id 1 ⠀ if (!ModbusRTUServer.begin(1, 9600)) { Serial.println("Failed to start Modbus RTU Server!"); while (1); } delay(10000); // configure a single coil at address 0x00 ModbusRTUServer.configureHoldingRegisters(0x01, 5); ModbusRTUServer.holdingRegisterWrite(0x01, 1); ModbusRTUServer.holdingRegisterWrite(0x02, 2); ModbusRTUServer.holdingRegisterWrite(0x03, 3); ModbusRTUServer.holdingRegisterWrite(0x04, 4); ModbusRTUServer.holdingRegisterWrite(0x05, 5); } void loop() { // poll for Modbus RTU requests ModbusRTUServer.poll(); holdingRegisterArray[0] = ModbusRTUServer.holdingRegisterRead(0x01); holdingRegisterArray[1] = ModbusRTUServer.holdingRegisterRead(0x02); holdingRegisterArray[2] = ModbusRTUServer.holdingRegisterRead(0x03); holdingRegisterArray[3] = ModbusRTUServer.holdingRegisterRead(0x04); holdingRegisterArray[4] = ModbusRTUServer.holdingRegisterRead(0x05); for(int i = 0; i < 5; i++) { Serial.println(holdingRegisterArray[i]); } } When trying to read registers 40001 - 40005 I get a the following error in ModScan "** MODBUS Message TIME-OUT** as shown below: ModScan Screen Capture I believe I have a wiring issue, but can't seem to get the wiring squared away, any help would be greatly appreciated!! Currently the wiring is as follows: Current Wiring (Not Working) Current Wiring - Top View Current Wiring - Side of MKR 485 Shield Current Wiring - Side of MKR 485 Shield This is my best understanding of the wiring based on the following schematics: MKR 485 Shield Schematic Uno Schematic DT-9003 USB-Serial Converter Links: MKR 485 Shield Page MKR 485 Shield Schematic Uno Schematic MAX3157 Datasheet DT-9003 USB-Serial Converter Manual ArduinoModbus Library ArduinoRS485 Library
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15 years Modicon for my day job. Arduino for my escape rooms. Building a new room and decided to combine them and add open source. So excited! Anyone else use this?
ModbusTCP and MQTT are supported via ethernet. There are a handful of different libraries for each, but I've personally used those.
ArduinoRS485
Posts with mentions or reviews of ArduinoRS485.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2023-03-03.
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Arduino Uno as Modbus RTU Slave with MKR 485 Shield - Not Communicating with PC - Please Help ;
Question: Can anyone assist me figure out the wiring between an Arduino Uno and MKR 485 Shield, and the shield and my PC? All related links are at the bottom of the post. Background: I am trying to use an Uno as a Modbus Slave, and cannot get my PC to read the holding registers (40001-40005). The code generates the registers and writes the values 1-5 to the corresponding holding registers which are printed to the serial monitor as shown below: IDE Screen Capture #include // ArduinoModbus depends on the ArduinoRS485 library #include long holdingRegisterArray[] = {0,0,0,0,0}; // initialize 5 long array for holding registers void setup() { // start the Modbus RTU server, with (slave) id 1 ⠀ if (!ModbusRTUServer.begin(1, 9600)) { Serial.println("Failed to start Modbus RTU Server!"); while (1); } delay(10000); // configure a single coil at address 0x00 ModbusRTUServer.configureHoldingRegisters(0x01, 5); ModbusRTUServer.holdingRegisterWrite(0x01, 1); ModbusRTUServer.holdingRegisterWrite(0x02, 2); ModbusRTUServer.holdingRegisterWrite(0x03, 3); ModbusRTUServer.holdingRegisterWrite(0x04, 4); ModbusRTUServer.holdingRegisterWrite(0x05, 5); } void loop() { // poll for Modbus RTU requests ModbusRTUServer.poll(); holdingRegisterArray[0] = ModbusRTUServer.holdingRegisterRead(0x01); holdingRegisterArray[1] = ModbusRTUServer.holdingRegisterRead(0x02); holdingRegisterArray[2] = ModbusRTUServer.holdingRegisterRead(0x03); holdingRegisterArray[3] = ModbusRTUServer.holdingRegisterRead(0x04); holdingRegisterArray[4] = ModbusRTUServer.holdingRegisterRead(0x05); for(int i = 0; i < 5; i++) { Serial.println(holdingRegisterArray[i]); } } When trying to read registers 40001 - 40005 I get a the following error in ModScan "** MODBUS Message TIME-OUT** as shown below: ModScan Screen Capture I believe I have a wiring issue, but can't seem to get the wiring squared away, any help would be greatly appreciated!! Currently the wiring is as follows: Current Wiring (Not Working) Current Wiring - Top View Current Wiring - Side of MKR 485 Shield Current Wiring - Side of MKR 485 Shield This is my best understanding of the wiring based on the following schematics: MKR 485 Shield Schematic Uno Schematic DT-9003 USB-Serial Converter Links: MKR 485 Shield Page MKR 485 Shield Schematic Uno Schematic MAX3157 Datasheet DT-9003 USB-Serial Converter Manual ArduinoModbus Library ArduinoRS485 Library
What are some alternatives?
When comparing ArduinoModbus and ArduinoRS485 you can also consider the following projects:
arduino-mqtt - MQTT library for Arduino