Thank you for so detail answer, phildunlap. As for polls every second, is that mean TCP keep alive will consume less bandwidth than TCP? Any figure about that? Estimated need more bandwidth of 5% or 20% like that?

Compare with Modbuse IP Transport type TCP, how many bandwidth saved if use Transport type TCP, keep alive?

Thank you MattFox, I get it!

Thank you MattFox, phildunlap and Jared Wiltshire,
I searched the folder, and only found momentFilter.js, moment-timezone-with-data.js, moment-with-locales.js, moment-timezone-with-data.min.js, moment-with-locales.min.js, which one I should modify? Is that mean to replace "string" to "YYYY/MM/DD"?

How to change date format on chart x axis? I want to change "22 May" to "May 22" etc, is that possible?

thanks, phildunlap

thank you, JoelHaggar, i will look into it.
sorry, phildunlap, I mean Modbus IP TCP keep alive. it do not work. anyway, Modbus IP TCP work well.
I have a question, what's the speed limit for modbust IP poll interval? 1ms or 50ms or 500ms or 1 second?

by the way, I can't make modbus persist tcp to work, it just poll data one time when system restart, and then do not update anymore. so currently i use modbus tcp connection, it work well for one PLC.

I want to know whether mango can meet my project capacity request. I try free version, and connect to 1 PLC by modbus ip, to poll 20 points, and I set poll interval is 500ms, and log to database every 3 minutes, it running well, but CPU keep busy, most of time 80%~100% occupied, and harddisk also busy, keep lighting flash, bandwidth arround 200KB/S, my computer is i5, 8G RAM. so I worry about if mango is possible to handle 50 PLC (1000 points, each poll interval 500ms) by same time? does mango has ever tested about maximum capacity limit? any proposals for this? thanks

ok, I will try.

thanks for your proposal, the only thing I worry about is if I set two Modbust IP master to poll data from the same Modbust IP salve, do they conflict or not? for example, I set Master A to poll data every 50ms, Master B poll data every 2 minutes, sometimes, A and B poll data at exactly same timestamp from the same PLC, what will happen?

sorry, I swapped Master ans slave, thanks for proposals, I will try modbus publish function.

yes, it's modbus datasource. the reason why ask this, is because I have many datasource, each of them have 20 points, only one of these points need poll immediately, for example, motor, I want to set it 50ms for poll interval, and other points I accept 5 minutes, if I set them all 50ms, I worry about bandwidth and hardware resource etc.

But how to set Master? I see there is a input form need fill in IP, that should be remote PLC IP adress, so this make localhost computer to be slave, for my understanding, Modbus IP Master should not set any IP address, am I right? I am a beginner and try to learn how to use Mango.

I see it can set modbus IP slave function, but how to set localhost to be modbus IP master?

that's useful function, thanks.
By the way, how to set point update periode? it seems only data source can set update periode, one data source may have many points need different frequency to update, is that possible to set point by point?

How to mass set limit value for a group points? for example, temperature of 100 rooms should be set in same limit etc.
If there are 1000 points, setting is difficult to work.