Arduino UNO, 5208 baud on single wire UART line

Projects Networking, Protocols, and Devices
1

Hi folks,
I am stuck on implementing communication to an actuator that I have with my arduino. Here are the Specs for the line I need to commucate with.

Electrical: 0-5V nominal single wire with common ground between nodes
Pullups to 5V in nodes
Format: 10 bit NRZ (Non Return to Zero) (1 start, 8 data, 1 stop)
Speed: Default of 5208 bps; other options available
Protocol: Command/Response with SRA slaved to ECM
Checksum: 2’s complement of sum of other message bytes
Idle Time: 10 bit times
Update rate: once every 200 msec, minimum

I have tried using newsofserial with a baud of 5208 with no luck. Even when I set the arduino to 4800 baud and just connect the Rx port to the line I don't get any values (even gibberish). I was given a small program that communicates with my actuator at said baud rate. I know the actuator/communication is working because I can send/receive data using the program.

Any help would be greatly appreciated.

Thanks

2

Even when I set the arduino to 4800 baud and just connect the Rx port

Try again at 5208 baud.

Link to the actuator?

3

How would I initialize the serial port to run 5208 baud?

I can't release the actuator document because it is proprietary.

I can however get you any info you need to know.

4

co1simba:
How would I initialize the serial port to run 5208 baud?

void setup( void )
{
  Serial.begin( 5208 );
}
5

Ok but how do I monitor the line with the Serial Monitor?

6

Ok but how do I monitor the line with the Serial Monitor?

The Arduino is on one end of the serial port. Is your actuator on the other end, or the Serial Monitor? They can't both be.

7

So my Ideal situation is to run the actuators UART line to digital2 running newsoftserial setting baud = 5208 and RX port on digital 2. Then running the Serial monitor using the default 0,1 pins on the UNO. Or just find a way to sniff the bus at 5208 baud so I can see the format of the messages being sent.

8

If I run a mega could I initiate Serial1 @ 5208 baud and Serial2 @ 9600 baud then use this?

 if (Serial1.available()){
      Serial2.println(Serial1.read());
  }
9

co1simba:
If I run a mega could I initiate Serial1 @ 5208 baud and Serial2 @ 9600 baud then use this?

 if (Serial1.available()){

Serial2.println(Serial1.read());
 }

Well the Arduino IDE's serial monitor is 'hardwired' to only monitor Serial port, but Serial1, Serial2, and Serial3 are avalible on a mega board for your external uart line. So:

 if (Serial1.available()){      // Serial1 = external uart on pins 18 & 19 running at 5208 baud
          Serial.println(Serial1.read()); // echo received data from serial1 channel to arduino's serial
                                                  //  monitor on pins 0 and 1 running at 9600 baud
          }

[/quote]

Lefty