12 Nov
2022
12 Nov
'22
8:26 p.m.
Can the magic control codes pass through to the remote
device or does the "black box" have to eat them?
According to a manual I found on the internet, it has three modes. One mode where the
"arming" character and the subsequent port selection character are not passed
through, one where it does pass through and one where there must be a (settable) delay
between the arming and port selection characters.
I looked at a picture of the main board of one of these black box COS units (code operated
switch) and it appears there are two UARTS back to back. Between the UARTs where the data
is parallel, there is an 8-bit comparator (74HCT688E) that checks the data flowing to an
8 position dip switch that lets you set the arming character. All sounds simple. But I
must admit, if I were to build something similar, I wouldn’t bother with two back to back
uarts, an MCU would certainly be the way to go.
73 Eugene W2HX
Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx
-----Original Message-----
From: Mike Stein via cctalk <cctalk(a)classiccmp.org>
Sent: Saturday, November 12, 2022 3:09 PM
To: General Discussion: On-Topic and Off-Topic Posts <cctalk(a)classiccmp.org>
Cc: Mike Stein <mhs.stein(a)gmail.com>
Subject: [cctalk] Re: Inline Serial Device?
Can the magic control codes pass through to the remote device or does the "black
box" have to eat them?
Makes quite a difference...
m
On Fri, Nov 11, 2022 at 5:14 PM W2HX via cctalk <cctalk(a)classiccmp.org>
wrote:
Thanks to everyone who responded. And thanks to Wayne
for the black
box suggestion. I have actually been thinking about that very product.
What it does is switch a master port to one of several other ports.
Not far from what I'm seeking. I was thinking of buying one of these
and hacking it to trigger a relay instead of a change of port. But
before I went down that path, I thought I'd ask if anyone knew something more fit for
purpose.
Seems not and either this black box unit with a hack or a mcu might be
my options.
Thanks all!
73 Eugene W2HX
Subscribe to my Youtube Channel: https://www.youtube.com/@w2hx
-----Original Message-----
From: Wayne S via cctalk <cctalk(a)classiccmp.org>
Sent: Friday, November 11, 2022 5:08 PM
To: General Discussion: On-Topic and Off-Topic Posts <
cctalk(a)classiccmp.org>
Cc: Wayne S <wayne.sudol(a)hotmail.com>
Subject: [cctalk] Re: Inline Serial Device?
Something like this…
https://www.ebay.com/itm/Black-Box-Corporation-Modified-SWED98174-Cos-
II-Code-Operated-Serial-Switcher-/165759564735?mkcid=16&mkevt=1&_trksi
d=p2349624.m46890.l49286&mkrid=711-127632-2357-0
Sent from my iPhone
On Nov 11, 2022, at 14:00, Fred Cisin via cctalk
<cctalk(a)classiccmp.org>
wrote:
On Fri, 11 Nov 2022, Chuck Guzis via cctalk wrote:
I keep a big jar around that's full of blue- and black pill MCU boards,
as well as a few of the more capable STM32F4 and F7 boards. Nowadays,
everything seems to look like a job for an MCU.
The MCU has replaced the hammer!
. . . "To a man with a HAMMER|(big jar of blue and black pill MCUs),
everything looks like a NAIL|(job for an MCU)"