Experimental Physics and
Industrial Control System

<[email protected]> · Tue, 29 Sep 2015 20:35:25 +0000

Hi,

On windows COM1 to COM9 are reserved names and can be used as is to access the serial port, higher COM ports are only available via win32 device namespace syntax e.g.   \\.\COM10      (the next release of asyn will spot these higher COM port references and automatically add the \\.\ prefix for you)

Regards,

Freddie

From: [email protected] [mailto:[email protected]] On Behalf Of Eric Norum
Sent: 29 September 2015 19:15
To: Heesterman, Peter J
Cc: EPICS Tech-Talk ([email protected])
Subject: Re: Serial port COM10: not work?

There may be a limit in the operating system, but not in the ASYN serial port driver (you are talking about ASYN, right?).  There's no check at all on the serial port name -- the drvAsynSerialPortConfigure serial line name argument is passed directly to the 'open' system call.

On Sep 29, 2015, at 11:04 AM, Heesterman, Peter J <[email protected]> wrote:

The devices (pump controllers) are named TT01, TT02, TT03, TT04, NT07 and NT10, respectively.
These were attached to COM1, COM2, COM3, COM4, COM7 and COM10 (only in the interests of matching the number scheme, above).

When I installed the software, the first five worked perfectly.
But the last one was unable to connect.

On a hunch, we re-mapped the last comport to COM8:, in the operating system.
Now all 6 work perfectly.

I wondered if there is a single-numeric-digit constraint, on the serial port number?

-- 
Eric Norum
[email protected]

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System