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There’s no enable pin broken out, so it must have automatic flow control.  That’s what you want.  This one, right:  https://www.amazon.com/ALMOCN-Adapter-Module-Converter-Indicator/dp/B09998FY4X?th=1

You said:

Currently the RS485 wires connected to the Y510-B into the mayfly are as follows: GND to GND, RXD to D11, TXD to D8, and VCC to sv5.

If th…[Read more]

Thank you so much for answering me I have been stuck for quite some time.

To answer your questions, I am running them separate because my Y504 Sensor requires 6+volts and needed a DC step up booster board and the Y510 sensor needs 5volts. Would it still be possible to put them on one RS485 and power supply?

I am unfamiliar with the NeoSWSerial,…[Read more]

Sorry, I coded up the ThingSpeak publisher ages ago only to prove to myself that I could get an MQTT publisher working. I’ve never used it beyond that. I don’t have a paid account so after the trial period I was locked out and I’m not willing to do much testing on an account tied to my personal email.

Anyway, the code for ThingSpeak is in the…[Read more]

AltSoftSerial only works on pins 5 and 6. That’s why there’s no place in the code to declare the Tx and Rx pins. It’s strictly limited to those two.
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<div dir=”auto”>Is there a reason you have the two sensors on separate RS485 adapters and power supplies? I’m fairly certain that the two sensors operate on the same supply…[Read more]

Can you provide more details especially in reference to your code and how you are connecting to thingspeak?

It’s been a while since I’ve used Atom.  Are you sure the program is compiling without errors and actually being uploaded?  If there are errors in the build, it won’t actually be uploaded.

In the early part of this year 2021, I did some regression testing using an Insitu LT500/SDI12 with a modbus board and telecom LTE, and I ran into a hard to find issue on the Mayfly 0.5b  – the Uart Rx line is unterminated..

When extending features, its not unusual that problems are uncovered in new ways of exercising the software.

As part of a…[Read more]

Thank you Anthony.  It sounds like this may be the problem.  It seems strange that I have 9 of 10 sites operating perfectly, but this site refuses to play nice.  I will try your solution when I get some time over the Christmas break.

Have a great Christmas and New Year.

James

The first explanation that pops to mind is that the DIY Modbus wing has power bleed from the digital pins when the power is turned off.

Modbus stop bits are high, which leaves the AltSoftSerial transmit pin (5 or 6) at 3.3V when the sensor power shuts down. This then bleeds through RS485 converter (when it is powered off) over to the switched…[Read more]

@neilh, we’re glad to have you doing the intensive testing, reporting what you find, and having patience with us over the years before we could dive in to this issues, and over these recent weeks and future months as we work out all the tech debt and also adjust to a growing data system (we have 400 million records!).

@aufdenkampe many thanks. Appreciate this is covering timing issues that are a bit hard to flush out.

I suppose I’m the messenger in checking the system to what appears to be the bar from the Mayfly, but its a pretty hard area to checkout – all I can say is that as the messenger I’ve seen the challenges in other systems and was trying to give…[Read more]