REFLECTOR: Panel layout opinions

[Jack Prock]

Think again!! RS232 ports are 1980's technology. They are so slow compared
to the high speed communications it is not even funny

 

Most of the RS232 ports are 9600 baud, which is about 1200 characters per
second, and that is not counting overhead of parity bits.

Even the highest baud rate is 56000 baud, which is 7000 characters per
second. 

 

Usb 2.0 which is what all computers have had for about the past 10 years is
408 Mbits /second, or  63,000,000 characters per second. 

So that would be 9000 RS232 ports simultaneously!!

 

It can EASILY handle 100 RS232 ports and not even break a sweat!!

 

The amount of data going to and from the HXr through RS-232 port is almost
noise to USB ports. my inner geek is showing. I'll shut up now.

 

Jack

 

From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of Don Johnston
Sent: Friday, January 31, 2014 7:53 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: Panel layout opinions

 

I can't say for certain, but I would be surprised if the HXr would be able
to send/receive to the nav radio, com radio, GPS, transponder, audio panel,
etc., through the USB port. 

 

On Fri, Jan 31, 2014 at 4:47 PM, Jack Prock <jackprock at wavecable.com
<mailto:jackprock at wavecable.com> > wrote:

Don,

 

If the only issue is the number of rs232 port on the back of the HXr,

I suggest that you think of this as just a computer problem. The HXr has
several usb ports on the back. 

You can get a 4 port rs232 hub that plugs into a single usb port. Or you can
get cables that have rs-232 on one end

and a usb port on the other. 

 

There are many less expensive solutions to getting more ports than having to
add a second HXr. 

 

Jack 

 

From: reflector-bounces at tvbf.org <mailto:reflector-bounces at tvbf.org>
[mailto:reflector-bounces at tvbf.org <mailto:reflector-bounces at tvbf.org> ] On
Behalf Of Don Johnston
Sent: Friday, January 31, 2014 10:00 AM
To: reflector at tvbf.org <mailto:reflector at tvbf.org> 
Subject: REFLECTOR: Panel layout opinions

 

Originally, I was going to go with a pair of GRT screens with a traditional
radio stack. But when the HXr came out that supported remote avionics and
the ability to use a tablet as a secondary display, I switched to that (this
is where not purchasing instrumentation and avionics until they're needed
pays off!)

So the new plan was a single 10.4" screen with all remote avionics and a
tablet (not permanently mounted) that would be used primarily for engine
information.

But recently I discovered that a single screen wouldn't work because each
device requires a serial port and there are only 8 ports per screen. So I've
got to add a second screen just to get more ports. :-(

Now my problem is where to put the second screen (see attached).

I could mount the second display directly next to the primary screen.  This
seems to be the most common layout. But the backup EFIS (Dynon D1) would
have to be mounted either very low on the panel or way off to the right. 

The other alternative is to center it on the co-pilot side. This would allow
the backup EFIS to be placed higher on the panel.  But the second EFIS would
be basically unusable from the pilot seat (viewing or controlling).  On the
other hand, if GRT doesn't come through with their IFR GPS and I have to use
a Garmin 400W, at least I'll be able to mount it in the center of the panel.
If I put the second screen adjacent to the primary screen, the only place to
put a panel mount GPS would be out of reach from the pilot. 

What do y'all think?

Don


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