32x32 RGB LED Matrix Panel - 6mm pitch

Row address select input A for the RGB matrix panel.

Row address select input B for the RGB matrix panel.

Row address select input C for the RGB matrix panel.

Row address select input D for 32x32 and larger matrix panels where present.

Clock input; Adafruit states CLK is one of the signals that must be connected to the matrix input connector.

Latch/strobe input; Adafruit notes LAT may be labelled STB on some panel variants.

Output-enable input on the matrix input connector.

Panel power input; this 32x32 RGB LED matrix family is powered from 5V supply connections.

Ground return for signal reference and panel power; Adafruit notes ground pins may be unlabelled but still need connection.

HUB75-style input ribbon connector; Adafruit distinguishes INPUT from OUTPUT and explains labels/arrows/notch orientation can identify the input connector.

HUB75-style chained output ribbon connector; Adafruit notes panels support chaining, though Arduino-class use is impractical and their Arduino library does not support chaining.