Tim,
I think your last paragraph says it all. This is
entirely supported by the following extract from
the EW MicroRecorder Manual, confirmed by a
physical inspection. From personal experience I
know that attempting to power a MicroRecorder via
a "Flarm cable" does unspeakable damage to the logger.
"The RJ45 lead has the following pin designations:
Pin 1 External power in 9-15 Volts (White/Orange)
Pin 2 5 volts out max 1 amp, if externally
powered, this can be used to drive a PDA (Orange).
Pin 3 NMEA directly from GPS, use with hardware versions 5 and below.
Pin 4 Serial in (blue).
Pin 5 Pilot Event, momentary grounding gives
update rate of 1 sec, for 30 sec. (White/Blue)
Pin 6 NMEA messages are- GPGSA, GPRMC, GPVTG,
PGRMZ at a default rate of 9600 baud (Green)
Pin 7 Reset pin, connecting momentarily to
ground will switch the microRecorder off. (White/Brown)
Pin 8 Earth/Ground (Brown)"
Geoff Vincent
At 05:42 PM 20/05/2010, you wrote:
Hi Urs,
I'm also puzzled by this.
Since the EW flight recorder is an IGC approved device, it meets the IGC
specification and therefore any cable wired to this spec should work,
whether it was designed specifically for EW or for any other IGC approved
Flight Recorder.
As you correctly say, it is an IGC requirement that pins 1-2 and 7-8 are
paralleled - the reason as I recall it is for compatibility between 6 and 8
pin RJ plugs.
If it is true that this paralleling defeats the reverse polarity protection
in the EW then it follow that EW has in effect got NO reverse polarity
protection, because all cables created to the IGC spec are the same.
The alternative explanation is that supplied EW cables don't have this
parallel wiring and therefore don't conform to the IGC spec.
Cheers
Tim
-----Original Message-----
From: aus-soaring-boun...@lists.internode.on.net
[mailto:aus-soaring-boun...@lists.internode.on.net] On Behalf Of Urs
Rothacher
Sent: Thursday, 20 May 2010 17:04
To: 'Discussion of issues relating to Soaring in Australia.'
Subject: Re: [Aus-soaring] TECHNICAL ALERT
1) IGC Flight Recorder specifications require pin 1&2 and pin 7&8
on the RJ-45 connector of a IGC compliant cable to be in parallel...
http://www.fai.org/gliding/system/files/tech_spec_gnss.pdf#page=32
2) There is no such thing as a "FLARM cable" or "FLARM connector".
FLARM has never shipped any assembled cables.
Am I missing something?
Urs
FLARM
-----Original Message-----
From: aus-soaring-boun...@lists.internode.on.net
[mailto:aus-soaring-boun...@lists.internode.on.net] On Behalf Of Mike
Borgelt
Sent: Mittwoch, 19. Mai 2010 18:43
To: Discussion of issues relating to Soaring in Australia.
Subject: Re: [Aus-soaring] TECHNICAL ALERT
Those of using EWMicrorecorders should be very careful to NEVER
plug a FLARM connector into the EW by mistake.
The EW has built in reverse polarity protection but the FLARM cable
by paralleling pins 1 and 2 and pins 7 and 8 on the connector defeats this.
Take care! Damage by this method constitutes misuse and is not
covered by warranty. The damage is quite distinctive.
Mike
Borgelt Instruments - manufacturers of quality soaring instruments since
1978
phone Int'l + 61 746 355784
fax Int'l + 61 746 358796
cellphone Int'l + 61 428 355784
email: mborg...@borgeltinstruments.com
website: www.borgeltinstruments.com
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