SRF485 with Arduino

[charalambos00]

Hello,

I recently bought an SRF485 ultrasonic ranger which I want to interface with an Arduino Uno.
I went through the technical specifications, but I am not sure exactly how to send commands to the SRF485 via the Arduino.
1) How do I send a break ?
2) Are digital pins 0,1,2 used to send/receive data to the SRF485 module?
3) If so, how would I send the commands using digitalWrite/digitalRead?
I would imagine they need to be sent serially, not with digital pins.
4) I connected A to RS485+ and B to RS485-, is that right?

Thank you.

[Gerry]

Sorry, we have never written an example for the Arduino/SRF485.
Also, I'm fairly sure the Uno does not have an RS485 interface so you would need to wire it up to an RS485 driver chip.

[charalambos00]

Yes I have an expansion board by DFRobot.

One very important question I have though regards the "break" command.
How can I send it programmatically to the SRF485 in order to begin transmitting a packet?