Converting old hardware serial code to newsofwareserial code

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JT007

Lake District, UK

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Electronics needs smoke to work, if it escapes its broken

Converting old hardware serial code to newsofwareserial code

« on: March 02, 2013, 12:08:01 pm »

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im working away on some old modbus communication examples but unfortunately they use the hardware serial port to transmit/receive.
could someone please suggest how it can be changed to use NewSoftwareSerial instead.

Code:

void setup()
{
const int baudrate = 9600;
if (baudrate <= 19200)
interframe_delay = (unsigned long)(3.5 * 11 / baudrate); /* Modbus t3.5 */
Serial.begin(baudrate); /* format 8N1, DOES NOT comply with Modbus spec. */
}


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johnwasser

Massachusetts, USA

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Re: Converting old hardware serial code to newsofwareserial code

« Reply #1 on: March 02, 2013, 05:50:00 pm »

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1) Use Arduino 1.0 or newer and SoftwareSerial
2) Create a SoftwareSerial object (http://arduino.cc/en/Reference/SoftwareSerial)
3) Use that in place of Serial.

Code:

#include <SoftwareSerial.h>
SoftwareSerial mySerial(10, 11); // RX, TX
void setup()
{
const int baudrate = 9600;
if (baudrate <= 19200)
interframe_delay = (unsigned long)(3.5 * 11 / baudrate); /* Modbus t3.5 */
mySerial.begin(baudrate); /* format 8N1, DOES NOT comply with Modbus spec. */
}