Presumably because PC com ports are also male and whatever you would have
plugged into that port or the USB converter replacing it would therefore have a
female connector; female<->female adapters are cheap. A female 25pin RS-232
port as in the M100 is relatively unusual, and is/was a parallel printer port
in the PC world.
m
----- Original Message -----
From: Mark Wickens
To: Model 100 Discussion
Sent: Wednesday, December 02, 2015 5:44 PM
Subject: Re: [M100] Full Null Modem Cable Cottage Industry?
I'm still not quite sure why all the USB to Serial converters end in 9-pin
male - so you need another cable to connect to pretty much anything.
Is there a reason why a null-modem configuration with a 9-pin female isn't
the norm? I can't think of one. 95% of people buying one of these things
probably wants that configuration surely.
Mark.
On 02/12/15 21:06, Georg Kaeter wrote:
USB to serial converter with a 6ft cable can be ordered directly from the
OEM of the chip for a reasonable price. See
http://www.ftdichip.com/Products/Cables/USBRS232.htm#UC232R-10. Just a DB25
connector w/housing has to be fitted to it.
Georg
Am 02.12.2015 21:28 schrieb "Kurt McCullum" <kurt.mccul...@att.net>:
Thanks for the confirmation Don,
There was suggestion to use two low profile gender changers, one
male/male and one female/female to make it work on with he M100.
The $45 price tag is a bit steep. I'm not sure when it went up but that
was the closest thing I found to the perfect off the shelf USB cable.
Kurt
On 12/2/2015 10:17 AM, Donald Kyllo wrote:
Hi Kurt,
I have one of these cables and yes, the housing is too thick for the
M100. It works fine for the 102 and 200.
Don
On 12/02/2015 09:50 AM, Kurt McCullum wrote:
I can't check all the details right now but I believe this is the USB
to db25 male null modem cable I posted about a few months back. Though the
price at that time was $25 not $45.
http://www.ebay.com/itm/FTDI-USB-DB-25-Male-Serial-RS-232-Null-Modem-with-Full-Modem-Handshake-Cable-/161782416490?hash=item25aafbc46a:g:U84AAOSwyQtV2kfV
Also, I think the housing is too thick for the M100 but there was
somebody on the list that tested it with both the 102 and 200 and it worked
fine.
Kurt
On 12/2/2015 9:00 AM, John R. Hogerhuis wrote:
If you were building one I would recommend an all in one cable that
hooks straight from a USB port to any model t particularly the model 100 with
no adapters necessary.
Also it should be full null rather than defeating flow control as
the old complink cable did in order to support programs like HTERM which rely
on flow control.
And ftdi is the only way to go on Windows.
Maybe a very small pcb that can be built into a thin hood shell
with a surface mounted ftdi chip and max232?
All that said you could accomplish mostly the same thing by simply
aggregating the proper OTS parts and software and offering it for sale as a
package with documentation. That way it takes out all the research and
guesswork and that's the real trouble.
-- John.
