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Xinyuan-LilyGO / T-Panel

This is an RGB screen with a pixel resolution of 480x480, featuring dual chips on board, ESP32S3 and ESP32H2 chips, supporting 7-24V voltage input, RS485 communication, and more.
GNU General Public License v3.0
18 stars 3 forks source link

RS485 information #3

Closed Bwooce closed 5 months ago

Bwooce commented 8 months ago

Small questions, after reading the RSM485 datasheet:

Nice board.

Llgok commented 8 months ago

Small questions, after reading the RSM485 datasheet:

  • S_GND is the isolated ground, so for RS485 GND wire?
  • D_GND is for the outer cable shield? or for non-isolated RS485 GND?
  • Is there a link to enable RS485 termination resistors? Or none on this board?

Nice board.

S_GND is the isolation voltage output negative pole of the module, usually used for connecting the ground wire of the signal line, mainly for transmitting data signals. D_GND is the ground wire of the digital circuit, used to connect the ground wire in the digital circuit.

The T-Panel_V1.0 version module RSM485MT5V has built-in terminal resistance, so there is no need to connect terminal resistance on the PCB and externally. The T-Panel_V1.2 version module does not have terminal resistance, so a 120-ohm terminal resistance is added to the PCB to ensure stable signal transmission.