Re: [Gumstix-users] gumstix

[Dave H. <dhy...@gm...>]

Hi Bill,

On 1/18/07, W. Werner <wil...@co...> wrote:
> Thanks Dave, yes I did. No go. So I enabled and tried all combinations there
> of . No go.  Then I go out my scope and looked at the connector. No activity
> on any pin, and no voltage on any pin. Think it's broke?

First you should make sure that your HyperTerminal is in fact working properly.

Also, there are two type of serial cables, a null modem variety and a
modem variety. The modem connector normally has a green connector on
the end. You want the null modem variety, which should be all the same
color.

Try disconnecting the serial port from the gusmtix.
Let's start at the back of the computer (on th DB-9) connector. You
should measure a negative voltage between ground (pin 5) and TxD (pin
3).

If you short pins 2 and 3 (on the DB-9 connector), you should be able
to type in HyperTerminal and see what you type.

If that works, plug in the DB-9 to mini-din8 cable. This page shows the pinouts:
http://docswiki.gumstix.com/Gumstix_motherboard_I/O
The pin numbers are from the perspective of looking at the waysmall board,

Connect pin 3 to pin 5 on mini-DIN connector. You should then be able
to type in HyperTerminal and see what you type.

Make sure HyperTerminal is configured for 115200 baud, 8 data bits, No
parity, 1 stop bit and no flow control.

When you power on the the gumstix, you should measure -5 volts (or
thereabouts) between Pin 3 and pin 5 on the female DIN connector on
the waysmall. If you're not measuring -5 here, then the waysmall is
probably bad.

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/