Development v12

Warning - Product Update

All the resources present on this section belong to Waspmote v12, Waspmote Plug & Sense! v12 and Meshlium v3.8.

If you have a Waspmote v15, Waspmote Plug & Sense! v15 or Meshlium v4.0 please go to the new Development Section.

Check what is your version and what are the differences between the old and the new one in this document.

» RS-485 03: Configuration Example

This sketch shows the use of the RS-485 standard, and the use of the main functions of the library.

Required Materials

1 x Waspmote
1 x Battery
1 x RS-485

Notes

- Waspmote must be powered with a battery
- RS-485 does not specify or recommend any communications protocol.
- For a complete communication protocol, please see the Modbus examples
- This example can be executed in Waspmote v12 and Waspmote v15

Code

/*         ------ [RS-485_03] Configuration Example -------- 
 *   
 *  This sketch shows the use of the RS-485 standard, and the use 
 *  of the main functions of the library. This standard defines 
 *  the electrical characteristics of drivers and receivers for
 *  use in digital systems. It does not specify or recommend any 
 *  communications protocol. For a complete communication 
 *  protocol, please see the Modbus examples. 
 *
 *  Copyright (C) 2016 Libelium Comunicaciones Distribuidas S.L. 
 *  http://www.libelium.com 
 *   
 *  This program is free software: you can redistribute it and/or modify 
 *  it under the terms of the GNU General Public License as published by 
 *  the Free Software Foundation, either version 2 of the License, or 
 *  (at your option) any later version. 
 *   
 *  This program is distributed in the hope that it will be useful, 
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of 
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 *  GNU General Public License for more details. 
 *   
 *  You should have received a copy of the GNU General Public License 
 *  along with this program. If not, see <http://www.gnu.org/licenses/>. 
 *   
 *  Version:          3.0
 *  Implement0ation:   Ahmad Saad
 */


// Include always this library when you are using the RS-485 functions  
#include <Wasp485.h>

// Number of retires
uint8_t retries = 0;
uint8_t result = -1; 
void setup()
{
  // Power on the USB for viewing data in the serial monitor
  USB.ON();
  // Print hello message
  USB.println(F("Hello, this is RS-485 communication configuration example"));
  delay(100);

  // Powers on the module and assigns the SPI in socket0
  while ((result !=0) & (retries < 5)) {
    retries ++;
    result = W485.ON();
    delay(1000);
  }

  if ( result == 0) {
    USB.println(F("RS-485 module started successfully"));
  } 
  else {
    USB.println(F("RS-485 did not initialize correctly"));
  }

  delay(100);

  // Configure the baud rate of the module
  W485.baudRateConfig(9600);

  // Configure the parity bit as disabled 
  W485.parityBit(DISABLE);

  // Use one stop bit configuration
  W485.stopBitConfig(1);  

  W485.transmission(ENABLE);  
  delay(250);
  W485.send("Waspmote RS-485 module connected to the network");

  delay(250);
  // Disables the transmission
  // Useful when sniffing the bus 
  W485.transmission(DISABLE);  
  delay(250);

 
}


void loop()
{
  // Sniffing the bus. All data will be printed in the serial monitor
  // If data in response buffer 
  if (W485.available()) 
  {
    while (W485.available()) {
      // Read one byte from the buffer 
      char data = W485.read();
      // Print data received in the serial monitor
      USB.print(data ,BYTE);
    }

    USB.print(F("\n"));
  }   

  delay(1);  

}

Output

H#
RS-485 module started successfully
Hello this is RS-485 communication configuration example

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