I just stumbled across this video while dipping my toe into learning about how rs485 works. I’d like to eventually build long term data collection into my off grid electrical system so I can see trends over the years of energy collected vs used. So far I’ve learned that I do not have enough spare time to tackle a project like this at the moment. Thanks for this video.
Ok I already found the voltage in the data for you looking at your video. That command 01 A3 01 00 00 00 00 23 93 (BTW those last two bytes 23 93 is the modbus checksum) The response is 01 A3 01 00 00 02 00 00 05 3D............. that 05 3D is the voltage field in HEX convert it to DEC =1341 just divide by 100 to get the float representation 13.41v
@@jackc781 I dunno about documentation, but you should be able to sniff the serial data like @MKme Lab did. But yes you'll need the software for the controller, contact the manufacture, they will probably send it to you.
@@fabiansteinwachs7001kindly elaborate, please. I got a MPPT delivered to me yesterday and I was hoping for one with WiFi/Bluetooth for connection for monitoring but it only has something the manual calls a communication port which turns out to be RS485. I'm looking for a way to be able to use it.
This is not the protocol spec! This is the modbus spec. What we have here it is some chinese trash (pseudo Modbus). Actually is not so bad, but is NOT modbus. I'll post a link to this device pseudo modbus protocol.
I just stumbled across this video while dipping my toe into learning about how rs485 works. I’d like to eventually build long term data collection into my off grid electrical system so I can see trends over the years of energy collected vs used. So far I’ve learned that I do not have enough spare time to tackle a project like this at the moment.
Thanks for this video.
😂 😂 😂 😂
Yeah, this doesn't look like a spectator sport. But always good to have things talking. Thanks to the vendor for making the tool available.
Ok I already found the voltage in the data for you looking at your video. That command 01 A3 01 00 00 00 00 23 93 (BTW those last two bytes 23 93 is the modbus checksum) The response is 01 A3 01 00 00 02 00 00 05 3D............. that 05 3D is the voltage field in HEX convert it to DEC =1341 just divide by 100 to get the float representation 13.41v
That is super helpful!
Can i find documentation or the manufacturer program somewhere? Looking to do the same!
@@jackc781 I dunno about documentation, but you should be able to sniff the serial data like @MKme Lab did. But yes you'll need the software for the controller, contact the manufacture, they will probably send it to you.
@Brad Cagle it is the same protocoll as ampinvt mppt chargers. o read all data from my sunnysky over rs485 and send it to my homeassistant
@@fabiansteinwachs7001 Thanks! I kind of figured it would be the same.
How could I obtain the 'Chinese' monitoring software? Is there a site where I could download it?
Hello sir, can you display the STEC product MPPT data on the PC monitor?
Do you have download of the software still?
Great project. Hope you post more soon.
This is great, thanks Eric.
I think you can use wireshark to decode and format the serial data to see the modus rtu commands.
This is just what came to my mind when he mentioned packets and sniffing, I think. The how though is beyond my current skill level.
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Hallo can. Share this aplication protocol.....
hey, if you active youtube channel, i need to ask something which i can find anywhere else. do reply.
Did you ever get anywhere with this project?
it is the same protocoll as ampinvt mppt chargers. you can use this protocoll.
@@fabiansteinwachs7001kindly elaborate, please. I got a MPPT delivered to me yesterday and I was hoping for one with WiFi/Bluetooth for connection for monitoring but it only has something the manual calls a communication port which turns out to be RS485. I'm looking for a way to be able to use it.
Cool
What's the chinese app name or download link
Your Chinese software link
maybe you can decompile that software and try to understand how it communicates with the device. this may be the only solution
Dear your software link
QUESTO REGOLATORE E' MARCHIATO ANCHE CON IL NOME . SOLAFANS , LO STO STUDIANDO ANCHE IO PER INSERIRLO IN HOME ASSISTANT SE POSSIBILE
full protocol spec modbus.org/docs/Modbus_Application_Protocol_V1_1b.pdf
This is not the protocol spec! This is the modbus spec. What we have here it is some chinese trash (pseudo Modbus). Actually is not so bad, but is NOT modbus.
I'll post a link to this device pseudo modbus protocol.
@@nickp5554have you gotten it yet?