I have an older cr210A model. has anyone had any experience with this version? It does not seem compatible with the navilink lite controller.
Craig
@dacarson, I wasnāt able to find 12v. I did find 5v on 1 pin, but the voltage dropped when trying to power the esp32 and didnāt work. I also found 24v when probing around, but the BUC I had only does up to 23v, so Iām just sticking with USB for power for now.
I have an NPE-180S2 and it does look like this byte is operating capacity for my unit, but at full tilt it is reporting 200% which is a simple fix.
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The board I am using can accept up to 32V:
- Supply voltage: 12 VDC (3.8V-32V)
Where did you find the 24V?
I find myself trying to hookup an NFB series boiler with NaviLink also to an ESP32.
Using a Y-connector for 8P8C/RJ45 & a MAX485 board.
Connecting to pins 4 & 5, tried reversing A&B, popped off the R7 resistor on one MAX485 boardā¦ everytime I connect it the boiler drops off from the Navilink [takes a minute, the mobile/cloud app crashes].
Iām not using the 12V/GND, the ESP is powered from USB.
I have disassembled the Y-connector, it looks that all pins/wires are connected.
I get that the wire protocol could be different from the NPE [I have one also], but I havenāt gotten that far yet.
has anyone made this work in parallel with Navilink? thereās a hint in post 80, albeit I havenāt bought this specific splitter/breakout.
I got data flowing in from a Navien NHB series boiler. It seems the packet format is somewhat different, for example index #1 is 04 instead of 05 that seems to be the case in other equipment what Iāve seen here. The boiler has separate set points for Domestic Hot Water and Space Heating so the data seems to be in different locations. When I have some more time I will try to map it and share in case useful for anyone else.
My memory is already failing me, but I want to say the 24v was on the small 2 pin connector just below the connector we are using for data.
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@smurf12345 Thanks, Iāll take a look at that connector.
With respect to command packets, I see pretty much the same pattern as @ejarrett documented earlier with a NaviLink attached.
I have not been able to work out what the byte after recirc. on/off does (byte 12). The āackā always follows the recirc. as documented, and byte 12 has the same value as the command. But subsequent commands have different values there.
I also see a value appear there for the On/Off command. For example, this is what I saw when I recently turned the unit off then on:
F7 05 0F 50 10 0C 4F 00 0B 00 00 00 AC 00 00 00 00 00 0C
F7 05 0F 50 10 0C 4F 00 0A 00 00 00 26 00 00 00 00 00 E4
Built a dashboard so I can observe the behavior of the unit. some of the visualizations are to help me understand the value.
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Hi all, just found this thread after having my Navien NPE240A2 installed.
I have an esp32/ wroom32 and a ttl to rs485 board wired up on a bread board.
I has python and esphome installed on my pc but ive mostly installed esp32 via web installs like wled and rat-gdo
I got to the point where i downloaded the files, out them on my hdd and run the esphome compile commands but i get an error that i didnt set the ota parameters.
Id love to get up and running and help out where i can.
Edit: Got itā¦ had to run as administrator and i got it installedā¦
I made a custom cable with an ethernet cable, and a JST connector (basically the same thing the original navilink connector is) then I spliced a Y into the other end, so I can have both the navilink and my esp32 listening to the same data.
My ESP runs off the water heater, but the navilink still has a power brick.
this is how the 12v works with the RS-485:
https://community.home-assistant.io/t/navien-esp32-navilink-interface/720567/39
I have not seen those Off & On commands with byte 12, unless those are the received after an on/off command is sent.
I was able to connect and receive data. This is great. I appreciate all of your efforts.
I did switch the Wroom 32 to use TX2 and RX2 in the yml file.
I noticed that after a few hours i was getting everything set back to 32* with no updates. After looking at the setup i noticed the TTL board RX light was very faint. Almost as if the 3.3v was being exhausted. I saw on my amazon rs485 to TTL board it handles 3to 30v so i switched from the 3.3v pin to the vin pin which is getting 5v. And its been a few hours now without any issue. Have any of you experienced this who are using the ESP32 and TTL board combo?
I always see numbers for byte 12 with the on/off command. Can I ask more about your configuration?
I have a NPE-240A with the NaviLink (not NaviLink Lite) unit attached, model BCM-CV10. I am not sure if it matters, but it the NPE is connected to COM port 1 on the NaviLink unit. I also donāt have the HotButton expansion board installed in the NPE.
I have this breakout board but I donāt see 12v on far left and far right pins. I am using the cable that came with the NaviLink unit to the breakout box.
So I figured out part of it at leastā¦
https://jheyman.github.io/blog/pages/RS485Sniffer/
said to connect RE & DE both to a GND on my ESP. I had previously left them floating. It now no longer breaks the NaviLink. But Iām not receiving any data on the UART.
Now i just have to find out how to decode the data from an NFB [which as noted by @NyxVale63] is probably very similar to the NHB.
Definitely looking forward to his update with the map of which bytes are which fields.
I have the same unit and believe the 240A does not provide the 12V on the rs485 connector. There is a āWifi Upgradeā kit out there that replaces the front panel and that I suspected might be the part needed to get the 12V. However, when I called Navien asking about it (was asking if there is a way to feed NaviLink from the heater rather than 12V external brick) they surprised me by saying that NaviLink is not even compatible with 240A.
Side note - the connector next to RS485 does seem to have 5V on some pins. Still exploring to see what that connector is and if it is possible to power feed the ESP from that connector.
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fwiw, Iām powering my NaviLink from a PoE to 12V adapter. This lets me reboot it remotely, if necessary.
Iām trying to piece together the breadcrumbs in this thread to get this going but itās fragmented and difficult to follow. Is there any single source, git, or tutorial for this set up?
The esphome part looks mostly covered here: GitHub - evanjarrett/ESPHome-Navien: ESPHome configuration for RS-485 control of Navien Hot Water Heaters
But Iām struggling with the hardware resources.