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<blockquote data-quote="laplace" data-source="post: 929826" data-attributes="member: 128480">Re: problem on openHi,You can try the device /dev/cu.usbserial instead (check with ls /dev if it exists).I think you must open using O_RDWR.Do you need to write a command to the port before reading?You can also try to set the speed to 9600.If that doesn't work try looping until read returns 1.I hope this helps.Regards,Magnus&nbsp; &nbsp; strcpy(bsdPath, &quot;/dev/cu.usbserial&quot;);&nbsp; &nbsp; fileDescriptor = open(bsdPath, O_RDWR);&nbsp; &nbsp; if (-1 == fileDescriptor)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; return EX_IOERR;&nbsp; &nbsp; }&nbsp; &nbsp; struct termios theTermios;&nbsp; &nbsp; memset(&amp;theTermios, 0, sizeof(struct termios));&nbsp; &nbsp; cfmakeraw(&amp;theTermios);&nbsp; &nbsp; cfsetspeed(&amp;theTermios, 9600);&nbsp; &nbsp; theTermios.c_cflag = CREAD | CLOCAL;&nbsp; &nbsp; &nbsp; &nbsp; // turn on READ and ignore modem control lines&nbsp; &nbsp; theTermios.c_cflag |= CS8;&nbsp; &nbsp; theTermios.c_cc[VMIN] = 0;&nbsp; &nbsp; theTermios.c_cc[VTIME] = 10;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; // 1 sec timeout&nbsp; &nbsp; int ret = ioctl(fileDescriptor, TIOCSETA, &amp;theTermios);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ret = read(fileDescriptor, &amp;c, 1);</blockquote>

[QUOTE="laplace, post: 929826, member: 128480"] [b]Re: problem on open[/b] Hi, You can try the device /dev/cu.usbserial instead (check with ls /dev if it exists). I think you must open using O_RDWR. Do you need to write a command to the port before reading? You can also try to set the speed to 9600. If that doesn't work try looping until read returns 1. I hope this helps. Regards, Magnus strcpy(bsdPath, "/dev/cu.usbserial"); fileDescriptor = open(bsdPath, O_RDWR); if (-1 == fileDescriptor) { return EX_IOERR; } struct termios theTermios; memset(&theTermios, 0, sizeof(struct termios)); cfmakeraw(&theTermios); cfsetspeed(&theTermios, 9600); theTermios.c_cflag = CREAD | CLOCAL; // turn on READ and ignore modem control lines theTermios.c_cflag |= CS8; theTermios.c_cc[VMIN] = 0; theTermios.c_cc[VTIME] = 10; // 1 sec timeout int ret = ioctl(fileDescriptor, TIOCSETA, &theTermios); ret = read(fileDescriptor, &c, 1); [/QUOTE]

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