Help with getting a new Device working

[slwessels]

Hi everyone,

I've bought a FT232RL device and would like to see if I can get this working.
CE-LINK USB to Rj45 (Rs232) Console (Ft232rl) 1.83m Cable

At the moment I'm able to connect to the device, but face some problems with the response.
I'm using the pymodbus driver and connecting to /dev/ttyUSB0 (internally displayed as /dev/serial/by-id/usb-FTDI_FT232R_USB_UART_AB0NEEMV-if00-port0)

Any help will be greatly appreciated.

Here's the debug log.
2023-02-03 17:07:35,648 DEBUG Using selector: EpollSelector
2023-02-03 17:07:35,650 DEBUG Connecting.
2023-02-03 17:07:35,690 DEBUG Client connected to modbus server
2023-02-03 17:07:35,691 INFO Protocol made connection.
2023-02-03 17:07:35,697 INFO Connected to /dev/ttyUSB0
2023-02-03 17:07:35,698 INFO Reading startup sensors rated_power, serial
2023-02-03 17:07:35,705 DEBUG send: 0x0 0x3 0x0 0x3 0x0 0x5 0x74 0x18
2023-02-03 17:07:35,708 DEBUG Adding transaction 0
2023-02-03 17:07:35,729 DEBUG recv: 0x0 0x3 0x0 0x3 0x0 0x5 0x74 0x18
2023-02-03 17:07:35,731 DEBUG Frame check failed, ignoring!!
2023-02-03 17:07:35,732 DEBUG Resetting frame - Current Frame in buffer - 0x0 0x3 0x0 0x3 0x0 0x5 0x74 0x18
2023-02-03 17:07:45,733 ERROR Timeout reading:
2023-02-03 17:07:45,734 INFO ############################################################
2023-02-03 17:07:45,735 INFO No response on the Modbus interface, try checking the wiring to the Inverter, the USB-to-RS485 converter, etc
2023-02-03 17:07:45,736 INFO ############################################################
2023-02-03 17:07:45,737 CRITICAL This Add-On will terminate in 30 seconds, use the Supervisor Watchdog to restart

Regards,
Stephan

[kellerza]

It seems like the RX&TX are simply looped back, since you receive what you send...

Do you know the pinout of the RS232 port, did you cut the connector and used your own connector&pinout? ...on the sunsynk the RS232 port is a DB9... I've only seen RS485 pins on the RS485, but have not looked into this at all recently

[slwessels]

Hi @kellerza
Thanks for the quick response.

This is a pre-crimped cable that I got from Takealot. Was taking a bit of a chance. I could probably cut it up and switch it around, but it seems like the best option would be to just go with one of the tested devices :-) ( I see they're back in stock).

Thanks for the quick response and for providing your code to the community!

Stephan

[kellerza]

Although someone have reported the RS232 works, no one has gone through the trouble to document this/create a PR on the sunsynk repo. So it would be good to do this once you've figured out the pinouts 😉

As you can see in the current readme, everyone uses RS485

[kellerza]

Did you manage to get it working? After rewiring you cable/probably? Did you have to add a db9 plug to get to the rs232 port?

[slwessels]

Hi @kellerza,

Unfortunately not. I haven't been spending time on this due to work and travel.
I did swap out the device with one I got from Communica (https://www.communica.co.za/products/hkd-usb-rs485-ttl-converter-ftdi) and there seems to be a bit more progress.

At the moment I'm getting a "Not Ready" and not a valid unit id - 1 error.

two questions on this:

1. Should I remove the Sunsynk dongle (so only one logging device at a time) and
2. modbus config on the Sunsynk reads 01 - so 1 should be correct right?

Here's the error:
2023-03-21 10:28:46,019 DEBUG Using selector: EpollSelector
2023-03-21 10:28:46,022 DEBUG Connecting.
2023-03-21 10:28:46,041 DEBUG Client connected to modbus server
2023-03-21 10:28:46,042 INFO Protocol made connection.
2023-03-21 10:28:46,045 INFO Connected to /dev/ttyUSB0
2023-03-21 10:28:46,045 INFO Reading startup sensors serial, rated_power
2023-03-21 10:28:46,050 DEBUG send: 0x1 0x3 0x0 0x3 0x0 0x5 0x75 0xc9
2023-03-21 10:28:46,053 DEBUG Adding transaction 1
2023-03-21 10:28:46,093 DEBUG recv: 0x1 0x3 0xa
2023-03-21 10:28:46,094 DEBUG Frame - [b'\x01\x03\n'] not ready
2023-03-21 10:28:46,108 DEBUG recv: 0x32 0x32 0x30 0x37 0x33 0x31 0x32 0x37 0x31 0x32 0xde 0x1
2023-03-21 10:28:46,109 DEBUG Not a valid unit id - 1, ignoring!!
2023-03-21 10:28:46,110 DEBUG Resetting frame - Current Frame in buffer - 0x1 0x3 0xa 0x32 0x32 0x30 0x37 0x33 0x31 0x32 0x37 0x31 0x32 0xde 0x1

[kellerza]

Hi,

1. Ideally remove the Sunsynk dongle
2. Try going through mbusd instead of connecting directly to the serial port

[slwessels]

Perfect! Thanks so much. That did the trick. All working now. Sunsynk dongle is still plugged in, but I'll remove if this gives me any issues.

Thanks so much for the help in getting my setup going!