[aprssig] Placer 450 GPS
Doug Ferrell
kd4moj at kd4moj.org
Tue Jul 26 11:09:57 EDT 2005
On Mon, 25 Jul 2005 w0ep at frii.com wrote:
>
>
> I'm sure the Trimble Placer 450 GPS has come up
> on this list sometime in the past. But I can't seem
> to figure out how to find archives or search them.
>
> Anyway, there are some of these units up on ebay, and
> I'm wondering if they would be good for use in a tracker?
>
> Chris
> w0ep
I use these at work (mobile data in fire trucks). 8 Channel parallel,
two rs-232 ports, digital I/O port (for running LED's to see what is
happening in the little box). The 450 dosen't have any lights to indicate
power/sats setc so we built a little "black box" connected to the digital
I/o port to indicate power and sufficent sats when we don't want to go to
the trouble of hooking a laptop to the Trimble.
There is a trimble config program to setup the ports baudrate,
protocols etc.
The ports can be configured for the Trimble ASCII Interface Protocol
(TAIP) and NMEA 0183 version 2.01.
Drawbacks.... only 8 channel and they loose lock quite frequently.
If you get it for a good price... then they might be worth it...
--
...DOUG, KD4MOJ
http://www.kd4moj.org
More information about the aprssig
mailing list