On 12/06/2016 12:19 PM, Johan Ström wrote: > On 06/12/16 12:07, Martin Patzak (GMX) wrote: >> On 12/06/2016 11:31 AM, Colin Law wrote: >>> In my code (in a node-red environment) if I get a value of 85 then I >>> retry after a timeout (1 sec I think) and only if I get three 85 in a >>> row do I accept it as 85. >> my problem is, that I cannot read a value 85 degC at all, I do however >> get error messages or time-outs, depending... > When reading /temperature of a DS18x20, and the sensor returns 85, the > owfs code will perform a re-read (including convert) up to 3 times in > total. With 1s timeout, that will always be too short, and the client > will timeout. Note that a client-side timeout does not abort the already > issued query; if you called /temperature it will still try to > convert+read 3 times, even if your client aborts after 1s. An > immediately following query with 1s timeout may thus fail as well (since > it just waits for the bus > 1s) thank you for explaining the inner workings of owserver. It sure looked like re-trying from my client-side.
I do drop this sensor and move on to the next one, when a read time-outs. I do get then sometimes, subsequent error on one or two of the following sensors, which could be caused like you say, that owserver of course keeps retrying. > > By using the /latesttemp mentioned earlier, you only perform the read, > and should thus not suffer from timeouts (given that the bus is not > already backed up with previous queries). > Note that a convert must always be triggered by using the > /simultaneous/temperature endpoint before. yes, I do exactly as you say, but cannot read a 85 degC value! Why is it only me??? Others seem to read 85 degC fine Is anybody with a LinkUSB able to read 85 degC? > > At least this is my understanding of it, I have not used latesttemp > myself.. :) > But as was mentioned by before, 85C is usually due to bad wiring/too low > power... Powered sensors ftw :) well, in my case I have real 85 degC the wiring and power-supply is ok. Johan, thank You for Your thoughts Martin ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today.http://sdm.link/xeonphi _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
