Using SV651 rs485 rf transmitter module with arduino

Projects Networking, Protocols, and Devices
1

I have a Chinese rf module and I'm trying to communicate with arduino. Here's the module.. It's 868MHz RS485 module and I connect one transceiver to arduino: RX->TX TX->RX VCC->5V GND->GND

and the other one to PC with SU108-485, a USB bridge that come's with the module.

I can send text from my PC to my arduino (using putty) but when I try to send back using nothing happens.

if (Serial.available() > 0) {
  Serial1.print("Hello World");
}

if I connect this arduino to another arduino I can see it's clearly transmitting.

So the problem is that I can read from the module but not transmit.

Does it matter the module is RS485 not RS232? Is the RX/TX voltage different? Would the code be any different for a RS485 than RS232 module?

2

Where is Rs485 module to arduino ?.

Also full code would help to assist you further, and which Arduino ?.

Essef 8)