fopen and timeout-poblem

[jumbojetjames]

hi,

in a "c"-source the programmer used the ANSII - fopen() to build streams to serial ports RS232. Does anybody know how to set the timeout of the read-functions e.g. the fgetc() - function ? the system now waits about 5 sec if the buffer of the port is empty.

best regards

Simon

[Al_S]

The RS-232 library has functions that make com easier than using fopen and fgetc.  It has the SetComTime function to set the timeout.

SetComTime (int COMPort, double timeoutSeconds);

The default timeout is 5 seconds.

[jumbojetjames]

ok, but the sources I got were written by using fopen() etc. do you know how to set the timeout there ?

simon

[Al_S]

Have you tried using SetComTime?

[RobertoBozzolo]

I haven't tested it, but CVI RS-232 library contains GetSystemComHandle function that returns the system handle to the com port used: this value should be passed to SDK SetCommTimeouts function to set appropriate timeouts for both input and output: maybe you can give a try to it.

Hope this helps