On Mon, 12 Feb 2018 18:00:57 -0800 (PST) JE Norton <[email protected]> wrote:
> Hi Greg, FWIW, I have a serial cable that is about 100 feet long and > my station has been operating for 5 years > John > > On Saturday, February 10, 2018 at 6:13:37 PM UTC-7, Greg Troxel wrote: > > > > I have a Vantage Pro 2 with a recent datalogger, and with the > > included 8 foot RJ11 extension cable and a PL2303 USB/serial > > adaptor (to a 2008 vintage Mac notebook running NetBSD), weewx is > > running fine. > > > > I am about to run cables from the console to a more reasonable > > place for the computer. I notice that Davis specifies 48' max (the > > 8' plus a non-supplied 40'). I am inclined to use some CAT3 or > > CAT5 cable and use 2 pairs, one with ground/TX and one with > > ground/TX, and wire up a short connecting cable at each end to a > > DB9. My planned run might be a little longer than the 48' spec. > > > > So I wonder: > > > > Has anybody used a too-long cable, and did it work ok? What > > type, length and ok or not? > > > > The datalogger is labeled serial, but I notice it doesn't say > > RS232. Is it real RS232 levels (-12V/+12V, ish), or TTL (0/5V)? > > > > Thanks, > > Greg > > > My house contains a number of too-long cables to a number of items. Usually there is adapter > cat5 cable > adapter These long cables are subject to collecting stray EMF, although the use of cat5 should lessen the effect. Purchasing and installing a number of ferrites has reduced my drop out rate. Liz -- You received this message because you are subscribed to the Google Groups "weewx-user" 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/d/optout.
