🚀 go-pugleaf

Steve Clemmer writes:

>I am developing a serial communications program and am having
>trouble with changing the data rate to 38400.  When the program
>calls BuildCommDCB with an argument of "COM2:38400,n,8,1", the
>return value is -1.  The same code works quite well at other
>rates.  Is anyone using comm ports at 38400?  If you are, what
>method are you using to initialize the the DCB?  The SDK
>Programmer's Reference, Vol. 3 indicates the values for the
>BaudRate field.  Has anyone succeeded in storing the value
>directly and operating at 38400bps.

>Thanks in advance.

>Steve Clemmer

Response:

I undertand that windows COMM drivers in 3.0 & 3.1 will only support
speeds up to 19200. If you wish to go above that a special serial card
and COMM driver is required. One that I am aware of is the Hayes Serial
card which will operate at speeds up 56000, and they supply the windows
COMM driver. It costs about $110 US. There is a reference to this card
in the Modems article in PC Magazine. I am not sure of the issue but I
think it was April/May/JUne or July 1992.

I hope this helps.

ckelly@fox.nstn.ns.ca