The infrared for Rx/tx is for electrical isolation of the computer connected serially from the circuit under test. Without it there is the possibility of blowing up your host computer...
Kevin P. Hannan AmeriCare Homecare 678-823-8155 www.americareinfo.com/ga4 Smyrna, GA Sent from my iPhone > On Dec 24, 2013, at 5:21 PM, rh_ <[email protected]> wrote: > > On Tue, 17 Dec 2013 18:20:34 -0500 > "William Pretty Security" <bill.pretty-0zYn > +0w1Mo1Wk0Htik3J/[email protected]> wrote: > >> It shouldn't be a problem. You just send simple text commands to the > > Famous last words! The reality is that the meter I'm looking at does > seem to have a driver for linux that I found on github. However the > protocol is strange. From what I've read it reads the LCD numeric > segments and translates that and sends the result. Haven't looked > at the other direction yet. > > Oh and some of the multimeters that use this chip have an infrared > LED that tx/rx to an LED tx/rx connected to the USB port. Strange. > But some folks have used this to create a wireless multimeter. > > >> meter and read back the ASCII result. >> So any language will do. For example I once used tow of these meters >> to generate a battery discharge graph. >> I just set one to voltage and the other to current and sampled both >> every couple of minutes. >> >> -----Original Message----- >> From: [email protected] >> [mailto:[email protected]] On >> Behalf Of rh_ Sent: Tuesday, December 17, 2013 3:40 PM >> To: [email protected] >> Subject: [beagleboard] Re: digital multimeter >> >> On Mon, 16 Dec 2013 19:19:04 -0500 >> "William Pretty Security" <bill.pretty-0zYn >> +0w1Mo1Wk0Htik3J/[email protected]> wrote: >> >>> Try EBay. >> >> Yes, of course, but lots of noise there. >> >>> I have a Radioshack meter with an RS-232 interface, and love it ! >> >> Never thought about a sampling interface until you posted this. >> I found one that has a USB port so I may get it. Just trying to >> figure out if there's a linux driver for this device. > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
