[WriteLog] SIIG 4 Serial Port PCI Board and MMTTY

Mike McCarthy, W1NR lists at w1nr.net
Sat Sep 26 02:49:37 PDT 2009

Most likely this is a driver issue. Are you sure you have downloaded the
latest drivers from SIIG?
Another possibility is the chipset don't support 5 bit operation. This
would mean getting a different card. Most of the USB-serial adapter
chips only support 7 and 8 bit codes. I have a bad feeling that 5 bit
slow operation is getting dumped in a lot of newer serial port chips or
is getting overlooked and not tested.
I have a cheap generic MOSCHIP board in my computer and it works just
fine, but it does require the latest drivers off their WEB site.
You could also try software generated FSK off the DTR pin. This would
bypass any 5 bit or speed restrictions on the chip.

Mike, W1NR

Aldewey at aol.com wrote:
> I am having trouble getting my new SIIG  PCI 4 Serial Port board to key FSK.
> I have a PC with one built in Serial Port.  The built in serial port (at 
> COM 1) keys FSK  no problem.
> When I install the SIIG board, it adds COM 5, 6, 7, and 8.
> I use COM 5 and 6 for Rig control with no problem.  However, if I select 
> COM 7 or 8 to key FSK in MMTTY, my PC crashes and immediately re-boots.  I 
> temporarily took the radio off of COM 5 and 6 and tried those for FSK - same 
> result.  No matter what port I chose on the SIIG board, selecting it to key 
> FSK crashed my computer.  It crashes as soon as I make the selection in RTTY
> Operating System is XP.
> Has anyone run into this issue?  Any suggestions on what I might try?
> 73,
> Al, K0AD

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