Javelin on COM1 did not respond

Phaedra DG

Hi,

I just wanted to share my experiences on this one, proud as I am that I found the solution·

I started to construct my own experiment board for the Javelin stamp, but I got stuck getting the "Javelin on COM1 not responding" error message.

I connected the power and COM as per schematic on page 14 of the Javelin manual, and checked and double-checked my connections, to no avail.
When I did an "identify" from the IDE, I got a yes for the loopback, and a no for "echo' and 'got status'.

A bit of searching on the web got me to the schematic of the original Javelin Stamp Demo board, and·I noticed that the connections differ from the schematics in the manual :

- pin 3 of the Javelin is not directly connected to pin 4 of the DB9 connector, but via a 0.1 microFarad capacitance
- pin 4 of the DB9 connector is connected via a 0.1 microFarad capacitance to Ground (Vss).

After adapting my connections like this, it worked perfectly.


Phaedra

Mr_Fanatic

good day my friend can you please post a screen shot on what of what you mean regarding the pin connection....that would be of great help..thanks[noparse]:)[/noparse]

Phaedra DG

Hello,

i couldn't find the URL for the schematic anymore, but I scanned it and added it in attachment.

Note : I found out that this error was coorected in the errata for the manual.

Phaedra

Peter Verkaik

Here are the Javelin Demoboard schematic and the javelin module schematic.

regards peter