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vrf SICL manual issues

Question asked by VRFuser on Mar 5, 2006
Hello from Gregg C Levine
Right you are.
It happens that I'm using as a COM3/ASR3 device a USB2Serial device which normally is used for PDA communications. And the other end is my normal serial port. Both have handshaking turned off.

I'm surprised I'm not seeing any problems now. However when I start on my next series of tests that will require moving down to a slower baud rate to accommodate your suggestions. I might also track down my spare communications device. It's an ISA board which has on it space for two ports. But I'm only using one such, and it'll be strapped to COM2.
---
Gregg C Levine hansolofalcon@worldnet.att.net
---
"Remember the Force will be with you. Always." Obi-Wan Kenobi

> -----Original Message-----
> From: Shawn Fessenden [mailto:shawn@testech-ltd.com]
> Sent: Sunday, March 05, 2006 1:06 PM
> To: VRF
> Subject: RE: [vrf] SICL manual issues
>
> > in this case ASRL3 and do something
> > with the data, either store it and
> > then forward it to the instrument
> > connected to ASRL1
>
> If that translates into COM1 and COM3 then there definitely will be
issues
> as they both use the same interrupt (IRQ4). If you stay at or below
9600
> baud you can disable handshaking to get around it, or use Xon/Xoff
above
> 9600. This information applies to serial ports over an ISA bridge
only
> (i.e., almost any standard serial port on almost any PC as far as I
know.
> That could be dated information though. I haven't kept up with mobo
design).
> Virtual serial ports won't exhibit the same behavior. There are
probably
> also PCI serial port boards that won't exhibit interrupt
restrictions.
> -SHAWN-
>
>
>
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