[Loadstone] Advice needed for SN changing on Holux slim 236

Shawn Kirkpatrick shawn at odyssey.cm.nu
Thu Nov 30 21:52:41 GMT 2006

Thanks for the report on this. This is the exact same problem I had with my 
Holux gr-230 receiver. Apparently for that model a later firmware prevented 
the bluetooth and sirf baud rates from getting out of sync so I'm quite 
surprised this problem shows up in a later unit. This problem is one of the 
reasons that loadstone doesn't do anything with the sirf protocol. You can 
switch your unit to sirf mode but from what I remember there's two places to 
set the baud rate in sirfdemo. I don't remember the exact procedure, after I 
screwed up my holux receiver and had to buy a data cable to fix it I never 
used sirfdemo again. If you get the baud rates right you should be able to 
switch to sirf mode, turn off static navigation, and then switch back to 
nmea mode. You will want to confirm the bluetooth baud rate, on my holux it 
was 9600 but maybe they've changed things for the newer units. The safest 
thing to do is to get the data cable and that way you can get the unit 
working propperly again if it goes wrong. You'll probably only use the data 
cable once but at least after that you can use it to charge the receiver as 

On Thu, 30 Nov 2006, Aedan O'Meara wrote:

> Hi Rob and list,
> Got that package Rob. Manythanks. However, in spite of being very patient
> and waiting for my friend with "working eyes" to assist with  the SIRFdemo
> software we successfully screwed it up!
> Of course, the friend had no time to read the tutorial. After studying this
> lenghthy document I can see where we went wrong.
> 1. Firstly, has anyone on this list successfully changed the static
> navigation setting on their Holux slim 236 gps? and if so then how did you
> do it?
> 2. It seems that the bluetooth baud rate is fixed at 38,400 but when you
> change from nmea mode to sirf binary mode the sirfdemo program sends a baud
> switch to the gps instantly changing it to 57,600 baud even though you set
> it to 38,400 before sending, whereupon the GPS can no longer talk to the PC
> as the bluetooth is fixed at 38,400 baud. Seemingly some gps receivers block
> this behaviour but not our Holux. So, after lenghty reading I have come to
> the conclusion that a USB cable is the only answer to this dilemma.
> Interestingly enough after restoring the gps successfully it is giving
> perfect data in Hyperterminal at 2,400 baud!. It is working perfectly in
> Loadstone as well again. I give up!
> However, if anyone has succeeded in performing this miracle on bluetooth
> please let me know.
> Also, where is best to get a USB data cable for Holux, Stateside is cheapest
> for us in Ireland.
> By the way, my friend managed to get my Holux back to factory settings by
> lifting one leg of the internal battery. He felt that looking at the size of
> the button battery it would last a month!
> Certainly, 24 hours without the main battery did not bring it back.
> Regards to all.
> Aedan.
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