Incorrect RS232 baud rates

[BillFulton]

Now have two PCMCIA RS232/2 cards which are running at 8 times specified baud rate. i.e. set speed to 300 baud, actual port speed is 2400.

Problem moves with card when swapped between laptops (including between Win2K & WinXP laptops).

Are these cards dead or is there a cure for this problem?

thanks

Bill Fulton

[LuI]

Bill,

you know, baud rate is done by dividing the internal crystal clock of a device by an apropriate factor. As typical baud rates are much slower than typical crystal frequencies, there's usually a pre-divider with a fixed division factor. This one might be selectabel by a kind of jumper. You probably have there a case of wrong settings (if there's a jumper) or the produver changed some HW/SW or somethings defective.
Its up to you to decide if you can live with this failure or not. As the baud rate control's values can almost ever be adjusted to finally reach the desired one, this might be an option.
You might as well check the manual for some hardware settings...

Just my 0.02 Euro!
Greetings from Germany!<br>-- <br>Uwe

[JoshuaP]

Is this a NI card? If so, what is the part number and serial number and NI-Serial version. We have two different PCMCIA cards that have different rate oscillators and it is possible that for some reason we are detecting the incorrect one on your system.

-Josh

[BillFulton]

One card is NI PCMCIA-232/2  Ser No 183884D-02 /D6D585  other is NI PCMCIA-232/2  Ser No 183884D-02 /D6E533

regards

Bill F

[JoshuaP]

That is one of the older boards that supports the lower baud rates. I'll run some tests and let you know what I find.

-Josh