Emax

I believe the 25 pin standard was due to the way that dumb terminals  
and printers were setup with hardware handshaking.
There are many combinations that can be used depending on length of  
wire, speed of connect, type of end device and type of host.
All vendors did not implement the same handshaking.

As time went on, the number of pins went down to nine as the  
handshaking became standardized and handshaking via software became  
more robust.

Regards,
Ted

On Nov 5, 2009, at 6:38 PM, Julian wrote:

On Thu, 05 Nov 2009 21:04 +0000, "gadgetfiddler"
<gadgetfiddler@...> wrote:
 > have you considered utulizing the printer port on a pc to make the  
data
 > transfer into the rs-422 port on the emaxII?
 > I've got a cord with a male printer port plug on one side and a  
female
 > serial port plug on the other.
 >

Are you sure it's an actual parallel to serial, or is it a serial DB25
to serial DB9? there is a standard for serial data on a 25 pin connector
(I have no idea why)

Anyway - the printer port won't work. we're talking very fast data rates
here.

I sent off a usb/422 adapter I'd made that works synchronously to
esynthesist a while ago, but it turns out that while it passed the
simple test program I had, there are some issues with it... I haven't
had time to work on them since, but I have some time coming up in a week
or two to try and debug it on my side with a bit more information (and
my new oscilloscope! woo!)

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