Experimental Physics and
Industrial Control System

On May 30, 2013, at 4:43 AM, Mark Rivers <[email protected]> wrote:

> This error:
> 
> drvAsynSerialPortConfigure("L0","/dev/ttyS0",0,0,0)
> asynSetOption("L0", -1, "baud", "9600")
> setOption failed tcsetattr failed: Input/output error
> 
> probably means either that /dev/ttyS0 does not exist, or you don't have permission to modify it.

I would have thought that existence or permission errors would be reported by the drvAsynSerialPortConfigure command itself rather than being reported by the asynSetOption commands.   The "Input/output" errors shown in the message kind of imply that "/dev/ttyS0" is present and accessible, but does not respond to tcsetattr commands.  Could it be that "/dev/ttyS0" doesn't actually refer to a termios serial device?   Seems awfully unlikely, but that is what the errors are reporting.

What hardware and operating system is being used?  What kind of serial port hardware?

-- 
Eric Norum
[email protected]

References:

Gauge controller with R232 serial port Vahe Sahakyan

Re: Gauge controller with R232 serial port Ralph Lange

Re: Gauge controller with R232 serial port Eric Norum

Re: Gauge controller with R232 serial port Vahe Sahakyan

RE: Gauge controller with R232 serial port Mark Rivers

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