Date: Tue, 2 Feb 1999 12:49:29 +1030 From: Greg Lehey <grog@lemis.com> To: Mark Turpin <mturpin@spel.com> Cc: questions@FreeBSD.ORG Subject: Re: Serial programming Message-ID: <19990202124929.H76680@freebie.lemis.com> In-Reply-To: <36B654AC.8489301D@spel.com>; from Mark Turpin on Mon, Feb 01, 1999 at 08:28:12PM -0500 References: <36B654AC.8489301D@spel.com>
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On Monday, 1 February 1999 at 20:28:12 -0500, Mark Turpin wrote:
> Hello,
>
> Ok, I feel really stupid having to ask this..
>
> I'm working on a program to communicate with an Amada Punch
> Press. It communicates serial. I looked through the lists and found
> a reference to the Serial Programming Guide for POSIX compliant
> Operating Systems. So using the information I gathered there I've
> opened the serial port like this
>
> fd = open("/dev/ttyd0", O_RDWR | O_NOCTTY | O_NDELAY);
>
> Then when I go to write to the port
>
> n = write(fd, "Hello This is a test", 20);
>
> n ends up being -1. I'm running this as root, I've tried with minicom
> and it works fine.
>
> Any suggestions?
Look at errno and fd.
Greg
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