search

syssi / esphome-jk-bms

ESPHome component to monitor and control a Jikong Battery Management System (JK-BMS) via UART-TTL or BLE
Apache License 2.0
405 stars 134 forks source link

JK BMS Display port not transmitting data #418

Closed Al1-ISSA closed 5 months ago

Al1-ISSA commented 5 months ago

Hi, I am trying to connect a 7inch display with a esp32s3 board to the display port of a JK-PB2A16. I keep receiving 00 as a response. Does any one know if the display port need a different frame format from the gps.

syssi commented 5 months ago

Yes. It's another protocol. See https://github.com/syssi/esphome-jk-bms/issues/118

Al1-ISSA commented 5 months ago

Yes. It's another protocol. See #118

Is there a pdf for this specific protocol ? I couldn't find one online and the company wouldn't provide one.

syssi commented 5 months ago

I don't have any details about the protocol unfortunately.

23900 commented 5 months ago
  1. Communication process Communication refers to the process of data interaction between the protective board and the display. The communication link is simplex communication. The protection board is used as the master device and the display is the slave device. The protection board operates at a frequency of 1HZ. It sends its own data to the outside at a certain rate, and the display receives the data and completes the corresponding functions.

2.display port protocol: Communication interface UART level standard RS485 Baud rate 2400bps Data bit 8 Stop bit 1 No parity bit

Chinese document protocol http://www.jk-bms.com/en/Upload/2023-12-05/1556482191.pdf