Experimental Physics and
Industrial Control System

Maren Purves <[email protected]> · Wed, 19 Aug 1998 09:07:27 -1000

Arne Freyberger wrote:
> 
> This may be more of a Vxworks question than an Epics question
> but I figured the expertise would be found in this group.
> 
> I have two serial devices to control.  These devices are configured:
> 
> Baud: 9600
> Bits per character: 1 start, 7 data, 1 parity, 1 stop
> parity type: odd
> 
> I am presently using a IP Octal Serial card from greenspring
> to accomodate the serial devices.  However the serial lines on
> this card default to 9600 baud, 8 data bits no parity....
> 
> I've looked in to the Vxworks tyLib package and can only find
> function calls to change the baud rate, and another OPT_7_BIT which
> I think will place the port in 7 data bit mode.
> 
> What I cannot find is a way to put the port in parity=odd and
> to look for 1 stop bit.
> 
> Has anyone ever configured a IP octal serial line??
> And if so could they send me a copy/example of their code?

We don't use the Greenspring cards, but ran into a similar problem
when we first started connecting serial line devices. We found that
we couldn't talk to the device in question directly from a dumb 
terminal because one of the characteristics the device wanted couldn't 
be set on the terminal. Our solution was to go through a terminal 
server right away (with the combination of drvAscii/drvSerial/tnetDev 
drivers I'm sure I have described here before). This works very well
for us, and it doesn't have the limit on the number of serial lines
that the Greenspring boards have. (If you have more devices, just 
connect another terminal server ...)

Just another way out ...

Maren Purves
UKIRT

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System