Michael J. Smith (smith++at++vsl.ist.ucf.edu)
Wed, 29 Nov 1995 18:37:18 -0500 (EST)
>
> i've run the fastrak at 19.2 with no problems. don't forget that there
> are some dip switches on the fastrak PCB that require tweaking when you
> change baud rates.
alternatively you can also send the sequence at 9600 baud to tell the
FASTRAK to change to 38400 and then open a connection at the new higher
rate.
>
> + Did anybody ever interface the Fastrak to a standard serial port (no ASO's
> + please) on any of the SGI's using the hardware handshaking cable and actually
> + get data from the unit with a baud rate higher than 9600? I had no luck on
> + my Indigo2 and finally had to settle for the 16BIT format and 16Hz sample
> + rates. I assume that with the right cable, I can exceed 9600 baud because the
> + modem in the other serial port runs at 19.2K or 38.4K.
> +
I've been able to get speeds up 19.2K and 38.4K from various SGI
machines. The trick is compensating for bad packets. With some simple
filtering of packets, even bad packets can be skipped and synchronization
maintained. Something about the sensor moving out of the confined range
also tends to cause a flurry of error packets which can cause problems.
Overall, i've found that the shared memory approach works well for many
types of input devices such as the Fastrak of Flock of Birds, etc.
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| Michael J. Smith University Of Central Florida |
| Visual Systems Laboratory Institute for Simulation & Training |
| Graduate Research Assistant 3280 Progress Drive |
| smith++at++vsl.ist.ucf.edu Orlando, FL 32826-0544 |
| ++at++cs.ucf.edu |
| Codesmith for hire |
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