Hi TJ,
I recently ran into a similar issue with a Jupiter T. No NMEA output. What I
found was the unit came up in Motorola Binary @ 9600 and sent only an
initial string out.
The solution here was to use a PIC. (I was actually working with a PIC done
by Tommy Sullivan called "3DFIXLED")
Here are the HEX commands to send to the unit to make it do 9600 baud NMEA.
1.) 0x40 0x40 0x57 0x62 0x01 0x34 0x0D 0x0A
This is the @@Wb1 command - switch from Motorola Binary to Zodiac Binary
2.) 0xFF 0x81 0x33 0x05 0x03 0x00 0x00 0x07 0xCB 0x71 0x00 0x00 0x00 0x00
0x01 0x00 0xFF 0xFF
This switches to NMEA. There are three additional strings that can be sent
to
assure sentence output. I'm not sure they are needed, but here they are:
1.) 0xFF 0x81 0x4E 0x04 0x03 0x00 0x00 0x67 0xB0 0x12 0x00 0x00 0x01 0x00
0x00 0x00 0xFF 0xFF
2.) 0xFF 0x81 0xEB 0x03 0x03 0x00 0x00 0x67 0x13 0x13 0x00 0x00 0x01 0x00
0x00 0x00 0xFF 0xFF
3.) 0xFF 0x81 0xF4 0x03 0x03 0x00 0x00 0x67 0x0A 0x13 0x00 0x00 0x01 0x00
0x00 0x00 0xFF 0xFF
There is no ACK that I see. I'd power up and wait a few seconds, then send
the first string, then wait a couple more secs and send at least the second
string.
After doing this, my unit now sends out GPGGA, GPRMC and GPGSA sentences @
9600 baud.
73,
Mike, N1JEZ
"A closed mouth gathers no feet"
-----Original Message-----
From: TJ Fiel <zulut...@yahoo.com>
Subject: Contact: Jupiter GPS questions
Message: Hello KO4BB,
Many thanks for making so many resources available through your
website. I'd never seen Labmon 7 before and it cured several
problems with previous versions.
I'm attempting to use a Jupiter serial GPS receiver with APRS. This
is an OEM version made for Etak/Sony about 1999, p.n. TU40-D310-011.
It uses the Rockwell Scorpio DSP (11577-11) but implements few
features. I've never found a datasheet or even a pinout for this
chip. Conexant stopped producing this chip about ten years ago and
now they don't appear to answer their phones. Apparently they never
released chip level data to the public for this DSP, only for
built-up GPS modules.
My biggest issues are automatically forcing NMEA out at startup and
possibly adding an RTC. Any insights you can give will be greatly
appreciated.
Best wishes and thanks,
TJ Fiel
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