I 'm quite new with electronics, so pardon me if mistaken.
I have the following components:
Arduino UNO
Linksprite RS232 Shield v2
My goal is to dispatch from a static message (static at the moment - I plan to add an Ethernet shield later and relay a message from UDP port) from arduino to DB-9 port.
For my coding/testing environment I am using a PC with a USB and RS232 port (COM1) and a null modem cable.
The steps that I followed in order to accomplish it are:
Soldered the pins on RS232 shield v2 (20151022_154938.jpg)
Hooked up the RS232 shield on the arduino
Set pin 2 as TX (20151022_154927.jpg)
Set pin 3 as RX (20151022_154927.jpg)
Opened IDE and uploaded the following code:
#include <SPI.h>
#include <Ethernet2.h>
#include <EthernetUdp2.h>
#include <SoftwareSerial.h>
SoftwareSerial mySerial(3,2);
void setup()
{
// Open serial communications and wait for port to open:
Serial.begin(9600);
mySerial.begin(9600);
Serial.println("begin initial Serial USB!\n");
mySerial.println("begin initial Serial DB-9!\n");
}
void loop()
{
mySerial.println ("static message DB9");
Serial.println ("static message USB");
delay(1000);
}
The code runs and on serial monitor I get the message "static message USB". The TX led on the RS232 shield is blinking every second (as it should)
I hook the null modem cable to DB-9 connector of the shield and then on the PC.
I open putty on COM1 (9600 baud , 8N1), BUT MY PROBLEM IS THAT I DO NOT GET ANY MESSAGES (static message DB9).
I managed to make it work by performing the following change:
SoftwareSerial mySerial(2, 3);
Right now I am able to view messages sent both on USB & DB-9 port using putty.
The next step is to make it work with Ethernet shield v2 and relay a message to DB-9 from UDP port.
The code that I am using right now is:
#include <SPI.h>
#include <Ethernet2.h>
#include <EthernetUdp2.h>
#include <SoftwareSerial.h>
#define UDP_TX_PACKET_MAX_SIZE 1024
SoftwareSerial mySerial(2, 3);
byte mac[] = {
0x90, 0xA2, 0xDA, 0x10, 0x01, 0xED
};
IPAddress ip(10, 15, 120, 47);
IPAddress gateway(10, 15, 120, 1);
IPAddress subnet(255, 255, 255, 0);
unsigned int localPort = 8888;
// buffers for receiving and sending data
char packetBuffer[UDP_TX_PACKET_MAX_SIZE]; //buffer to hold incoming packet,
char ReplyBuffer[] = "acknowledged"; // a string to send back
// An EthernetUDP instance to let us send and receive packets over UDP
EthernetUDP Udp;
void setup() {
// start the Ethernet and UDP:
Ethernet.begin(mac, ip, gateway, subnet);
Udp.begin(localPort);
Serial.begin(9600);
mySerial.begin(9600);
}
void loop() {
// if there's data available, read a packet
int packetSize = Udp.parsePacket();
if (packetSize)
{
IPAddress remote = Udp.remoteIP();
Udp.read(packetBuffer, UDP_TX_PACKET_MAX_SIZE);
Serial.println(packetBuffer);
mySerial.println(packetBuffer);
Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
Udp.write(ReplyBuffer);
Udp.endPacket();
for (int i = 0; i < UDP_TX_PACKET_MAX_SIZE; i++) {
packetBuffer[i] = 0;
}
}
delay(10);
}
I am facing the following 2 problems:
In case I change the baud rate to 1200 instead of 9600 for both serial ports, I do get the message on COM, but I do not get the message on DB-9
In case the baud rate is 9600 and the messages are in Greek they are not correctly displayed on DB-9 - even though I change the encoding on putty and they are correctly displayed on IDE's Serial Monitor
