I had simply thought that the outputs when turned on are actually switched down to -VE (gnd)
1 = output floating (High) 0 = output is actually switched to -VE (GND). Thus 0 = ON A lot of PIC devices when there outputs are switched on take its output pin to GND. This arrangement works well especially on initial powerup rob -----Original Message----- From: Guy COLIN [mailto:guy.co...@gmail.com] Sent: Monday, May 17, 2010 5:20 AM To: owfs-developers@lists.sourceforge.net Subject: Re: [Owfs-developers] DS2413 writing to PIO: owfs 0=OFF Maxim 0=ONWhy? > That's true when I first tried to echo 1 to turn on a relay on the > hobby boards 8 channel IO board, but notice this: > > 1gargamel:/etc/owfs/bus3/aux/29.E73E06000000# cat sensed.0; echo > 1 > gargamel:/etc/owfs/bus3/aux/29.E73E06000000# echo 1 > PIO.0 > gargamel:/etc/owfs/bus3/aux/29.E73E06000000# cat sensed.0; echo > 0 > gargamel:/etc/owfs/bus3/aux/29.E73E06000000# echo 0 > PIO.0 > gargamel:/etc/owfs/bus3/aux/29.E73E06000000# cat sensed.0; echo > 1 > > > This is not super obvious :) > I agree this not super obvious, but I think it's because of Maxim: the Maxim PIO status register give 2 bits per PIO : PIO pin state and Latch state owfs give 3 informations per PIO: PIO latch and sensed I understand that owfs PIO should be use only for write. To read the actual state of the pio sensed should be use (the latch is the latch) owfs sensed and latch are acquired from PIO register reading but owfs pio is used to write to the pio. Paul is this correct? Thks -- Guy ---------------------------------------------------------------------------- -- _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.819 / Virus Database: 271.1.1/2876 - Release Date: 05/16/10 04:26:00 ------------------------------------------------------------------------------ _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
