Hello, I am trying to connect a DRF7020D27 via the SofwareSerial library and send RD command but I can't receive any response from the device. The device should be working on the 9600 band as a default. I am using an Arduino Uno. I tried with both enable pin high and low. Connect RXD to 2 and TXD to 3 Vcc to 5v and GND to GND. Can anyone help me to get a response from this device?
#include <SoftwareSerial.h>
SoftwareSerial mySerial(3, 2)
void setup()
{
Serial.begin(9600);
mySerial.begin(9600);
Serial.println("Initializing...");
delay(1000);
}
void loop()
{
updateSerial();
}
void updateSerial()
{
delay(500);
while (Serial.available())
{
mySerial.write(Serial.read());//Forward what Serial received to Software Serial Port
}
while(mySerial.available())
{
Serial.write(mySerial.read());//Forward what Software Serial received to Serial Port
}
}
Have you tried connecting the DRF7020D27 to your PC via a USB-TTL UART interface board (e.g. CP2102) to see if you can talk to it from a terminal program? That might establish that you have the right baud rate and that the unit is working. If you can't talk to it at 9600, try some of the other common baud rates instead.
markd833:
Have you tried connecting the DRF7020D27 to your PC via a USB-TTL UART interface board (e.g. CP2102) to see if you can talk to it from a terminal program? That might establish that you have the right baud rate and that the unit is working. If you can't talk to it at 9600, try some of the other common baud rates instead.
Sadly I don't have an interface board right now but I will try other baud rates thank you.
wildbill:
Looks like you need to pull SET pin low as well.
The Arduino SoftwareSerial uses "RX, TX".
Your have pin 3 for RX and pin 2 for TX. That means the module RXD should be connected to pin 2 and TXD to pin 3.
Is this the first time you connect a serial communication ? What goes out (TX) from one device goes in (RX) in the other device, unless the labels are wrong, which happens sometimes on USB-serial modules.