Problems receiving data from serial device

Hello,

I am trying to receive data from a serial device - a motor controller. This controller reports position, velocity, acceleration, and the status of the device over a serial interface.

I have opened the correct comport, have the baud rate set to the correct value, and am able to write commands to the device and have it respond properly. However, I am unable to get any kinds of messages from the device.

The fprintf(s,'R/n') command will write the command 'R' to the serial device - this requests the status of the device (i.e. busy, idle, able to recieve inputs, etc). When I am connected to a serial port console (Putty), I get a status message reading back in the console - a *R, *B, *S, or *C, depending on the status of the device.

This is not the case for Matlab. I have tried fscanf, freadf, fgets, and basically every kind of serial communication command that I can find online. fcanf will return the last command that was sent to the device, as opposed to the status - similar outcomes for the other commands.

Here is an example of what is occuring.

    >> s = serial('COM6');
    >> fopen(s)
    >> s.Terminator = 'LF/CR';
    >> fprintf(s,'R/n')
    >> fscanf(s)

ans =

R/n

Help is very much needed and appreciated - I'm at a loss.

[Star Strider]

I’m not sure what to suggest, other than to go online to get the documentation for the interface hardware and driver. I don’t have experience with motor controllers, but remember having to do that to understand how to get data from a fingertip pulse oximiter connected to a USB port (virtual serial port).

You don’t say what you’re doing in any detail, so this is only a guess.