Serial port stops receiving data after an hour or so

Hello,

I'm running MATLAB 2015a and have assembled a program that sends and receives data from a PLC. Here's the basic set up:

% Define the serial port

kv_serial = serial(serial_port, 'Terminator', 'CR/LF', 'Parity', 'Even');
kv_serial.BytesAvailableFcnMode = 'terminator';
kv_serial.BytesAvailableFcn = {@grinder_callback};

% Define logging properties

log_path = ['./Logs/grind_' datestr(now, 'mmddyy_HHMM') '.txt'];

kv_serial.RecordMode = 'index';
kv_serial.RecordDetail = 'verbose';
kv_serial.RecordName = log_path;

% Open the serial port

fopen(kv_serial);

% Record the serial

record(kv_serial);

% Send a serial break

serialbreak(kv_serial, 1000);

Recently, MATLAB has stopped reading from the serial port about an hour into execution. Strangely, I can send commands to the device via MATLAB and have no problem doing so - it's just that the ValuesReceived property stops incrementing and MATLAB stops recognizing any communication from the PLC.

What's really annoying is that restarting MATLAB is the only way to reestablish a fully working connection.

I'm at my wits' end and would appreciate any ideas or help!

[Walter Roberson]

If you can spare the time, it would be interesting to find out whether it happens if you are not recording.

[sir_kitty]

Oh, that's a good idea. I'll try it out tomorrow morning!