Can a BS1 control a PSC?

Kevin B Slater

· According to the help file the BS1 SEROUT command can communicate at 2400,N,8,1.· According to the PSC manual it communicates at 2400,N,8,2 at start-up.· I have in fact hooked up a PSC to·P0 of my BS1 and ran the following program.

' {$STAMP BS1}
SYMBOL buff0 = [color=purple]B0[/color]
SYMBOL buff1 = [color=purple]B1[/color]
SYMBOL buff2 = [color=purple]B2[/color]

  [color=blue]DEBUG[/color] [color=red]"Finding PSC"[/color], [color=purple]CR[/color]
  [color=blue]SEROUT[/color] 0,0, ([color=red]"!SCVER?"[/color])
  [color=blue]SEROUT[/color] 0,0, [color=purple]CR[/color]
  [color=blue]SERIN[/color] 0,0,(buff0,buff1,buff2)
  [color=blue]DEBUG[/color] [color=red]"PSC ver: "[/color], buff0, buff1, buff2, [color=purple]CR[/color]

· The only thing I see in the debug window is "Finding PSC".· The green LED on the PSC does flash for a brief second.· So I assume that the difference in the stop bits would not allow the BS1 to control the PSC.

· Are my assumptions correct?

Kevin

ADDENDUM:· I just hooked the PSC to my BS2 and ran the sample program in the PSC manual to check the version number and it does work so I know that my PSC is working and it is hooked up correctly.

Post Edited (Kevin B Slater) : 6/19/2005 8:19:14 AM GMT

Bruce Bates

Kevin -

According to the PSC documentation I just consulted, the proper command to retrieve the version number is "!SCID?",CR not as you have indicated. I'd try that first.

Regards,

Bruce Bates

Jon Williams

Your SERIN syntax is wrong -- try this:

Main:
· DEBUG CLS, "Finding PSC", CR
··SEROUT 0, OT2400,·("!SCVER?", $0D)
· SERIN 0, OT2400, buf0, buf1, buf2
· DEBUG "PSC Version ", [url=mailto:#@buf0]#@buf0[/url], [url=mailto:#@buf1]#@buf1[/url], [url=mailto:#@buf2]#@buf2[/url], CR
· END

The BS1 SERIN instruction puts *wait* qualifiers into parenthesis -- so in your version of the program the BS1 is waiting to match whatever you currently have in buf0, buf1, and buf2.

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Jon Williams
Applications Engineer, Parallax

Post Edited (Jon Williams (Parallax)) : 6/19/2005 1:48:00 PM GMT

Chris Savage

Bruce Bates said...
Kevin -
According to the PSC documentation I just consulted, the proper command to retrieve the version number is "!SCID?",CR not as you have indicated. I'd try that first.
Regards,
Bruce Bates

Bruce,

·· Please download the latest version of the documentation from our website.· I believe the version you have is somewhat outdated.

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Chris Savage
Parallax Tech Support
csavage@parallax.com

Kevin B Slater

Jon,
· As usual your answers are helpful and informative.· The program worked like a charm, other than the '?' being left off the SCVER command.

· I downloaded the new manual for the PSC and the sentence that had the communication settings had been changed to read that the PSC is set at 2400 baud when powered up.

· I took the time to change the programs in the PSC manual to BS1 format.· If there is a better way to code these programs by all means let me know.· I started on the Javelin, and I just received my BS1 that I bought from the crazy warehouse manager that was selling stuff on eBay! · So my PBASIC is deep in the learning stage.

Thanks again,

Kevin

Post Edited (Kevin B Slater) : 6/19/2005 8:16:05 AM GMT

Jon Williams

Oops ... that'll teach me for not using copy-and-paste when I could. Original post is fixed (for others).

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Jon Williams
Applications Engineer, Parallax

Kevin B Slater

No problem Jon, it did cause me a hiccup when I copied the program from the forums as I didn't want to introduce my own errors in to your program. Tried the program didn't work, so I was about to post another message that it wasn't working, I then decided to go though the program again and just happen to notice the problem.

Thanks so much again for your and Parallax's support.

Kevin