Re: OpenG Serial Port API

[<alb...@ph...>]

Good start Martin

I attach a use case that even VISA does not handle nicely.

One of the problems with the VISA serial implementation is that after 
opening the port you have to specify extra settings before using the 
channel.
VISA takes the default settings from the operating system but normally you 
 initialize these settings after opening in VISA.
This is shown in the new templates for instrument drivers. Only for serial 
you have a special VI to configure the port.
It not only makes instrument driver VI's look ugly but also has some weird 
effects on ports when changing the baudrate after already initializing the 
port.
Sometimes the instrument chokes on an inadvertently send hiccup on the 
line. 
It would be nice to inform the operating system of new "default values" 
before really initializing the port..

I worked out a way to add these settings to a VISA resource name but did 
not yet inform the operating system.
something like    ASRL1::INSTR ;baudrate=9600;parity=even
In fact my application accepts the eventual hiccup after opening the port 
because I did not have the time to sort out how to inform the OS.

If you are interested I can send you the VI's but 
So even when using VISA for serial we need such a special serial open.

Albert Geven                                         Tel  +31 (0)40 27 
43019
Philips Research                                 Fax +31 (0)84 722 9844
prof Holstlaan 4        WAA01             Email  alb...@ph...
5656AA Eindhoven