Also wondering if part of the IP related circuitry is exceeding temperature limits as it would not be the first time temperature has been an issue for some of Rigols designs.
And may explain why it is intermittent for me as my gear is in the garage (sadly) which is at the mercy of ambient temperatures.
In re-reading your original post, I see that your DP832A’s are rebooting. Whereas the jc101 and ornea are experiencing a loss of the Ethernet connection but no rebooting.
Because your DP832A is rebooting, please ignore my previous suggestions about using the USB connection to retrieve data (error messages; register values; CV vs CC status) after the failure. It’s unlikely that the DP8xx will contain any useful data after a reboot.
For those experiencing loss of the Ethernet connection, NI suggests
http://digital.ni.com/public.nsf/allkb/7FBE9E5CD0BD8FAF86257A09003E8253: Windows Device Manager > Network adapters > network adapter > Power Management tab > uncheck “Allow the computer to turn off this device to save power”. It’s possible that this might account for the variability jc101 and ornea reported in the elapsed time before loss of the Ethernet connection, i.e., the Windows timers are probably affected by other activity the user is performing on the PC. But this would not account for jc101’s new-IP-every-5-minutes experience. (Another well-known technique for flakey behavior is to use the Device Manager to uninstall the device then Scan for Hardware Changes or reboot to let Windows re-install the driver.)
Re a potential over-temperature condition, if your DP832A loses the Ethernet connection but does not reboot, your code could query (using USB) the over-temperature bit in Questionable Status Register (QSR) but the temperature problem, if it exists, might or might not cause that bit to be set. I wonder if this coding effort is worth the time; if you simply enable over-temperature protection (Utility > System > OTP), the DP8xx should turn off all outputs if an over-temperature condition is encountered (but only those over-temperature conditions which the DP8xx is designed and programmed to detect). So, if you encounter both outputs being off and the Ethernet connection dropped, an OTP condition is a likely cause. You could also use NI Max to query the QSR via USB; I’m not sure how long the over-temperature bit remains set and what events reset the bit.
Summary of thread so far…
PROBLEM: ETHERNET CONNECTION DROPPEDjc101:
... DP832A 01.14 (and with 01.13).
... Acquired early 2014 (2.5 years old at time of initial post in June 2016).
... New IP every 5 minutes but some days Ethernet communication is more reliable.
... Problem occurs even with static IP.
... Swapped Ethernet cables, switch ports.
NF6X:
... DP832
... Might have noticed LXI splash message pop randomly.
ornea:
... DP831 01.14
... DP831 stays online 6 - 17 hours.
... Like jc101, sometimes the problem occurs and sometimes it does not.
... Problem occurs with DHCP and static IP.
PROBLEM: REBOOTINGvertual:
... DP832A #1 01.09: 3 years old (late 2013). Self reboots once per several months.
... DP832A #2 01.14?: new (late 2016). Self reboot once per 1-2 days.
... NOTE that vertual is experiencing REBOOTS rather than just losing the Ethernet connection. No one else has complained of reboots (at least in the couple of thread pages where this Ethernet issue has been discussed).
... In one instance, the DP832A automatically turned off both CH1 and CH2, the display went blank for 0.5 second, and the DP832A took 2-3 seconds before it was usable again, and the Ethernet connection was dropped. (Comment by eelliott: over-temperature protection (OTP), if enabled, could turn off both CH1 and CH2 -- but the remainder of the behavior seems flakey.)
... Static IP.
... His matlab program queries current and voltage for CH1 and CH2 once per second. (Comment by eelliott: when my program performs a similar action (repeatedly querying different channels), I hear a lot of relay clicking. Could this frequent relay activity create a problem over an extended period?)
... The DP832A's are located in a garage (meaning that temperature and humidity might be more variable than most lab settings. Insects? This is a bug thread.
).
NO PROBLEMSLaurentR:
... DP832
... Is accessing via script over Ethernet but has never had Ethernet connection drop. Including one test with 24-hour elapsed time.
eelliott:
... DP832 01.14 (purchased July 2014) and DP811A 01.14 (purchased June 2015).
... Uses a custom C# application and NI VISA library. Never encountered the Ethernet dropping but has never run hours-long tests.
... Static IP.
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