Read full answer from serial device

Hi to all,

I have a serial device (9600, 8N1) that works in this way:

• I send a request command, i.e., "OP\n"
• it answers with "0.14\r\n52.32\r\n"

I need to always send a request command to obtain an answer from the device, so I should use a loop.

Now, I'm trying to use the serial functions under Matlab:

device = serialport("COM4",9600)

writeline(device,"OP")

readline(device)

it works, but I only get a part of the answer and not the full answer. I get the first double value and then I have to run it again to get the second one. Moreover, it seems that it is not able to handle the \r\n.

How can I continuously acquire from the device by correctly saving the values?

Thank you!

Answer 1

[Alexander]

You are right, readline reads exactly to the first terminator, so it is handling the terminator correctly. Try "read" instead, e.g.:

data = read(device,17,"char");

But you have to parse the data afterwards to your needs.