what represents tx and rx? Is there a pinout mapping?

The terminal block itself only has the numbered pin information on each screw terminal. The Arduino Mega 2560 has 4 UARTs (8 pins) that can be used for external communication. This link might help: https://www.electroschematics.com/7963/arduino-mega-2560-pinout/

Does this draw power from the Arduino or can a separate 5V be supplied to this board?

It draws a very small amount of power (Only for the red LED) from the Arduino Board if you only works with. Also you can connect a external power supply through the dedicated terminals.It offers the same Arduino functionalities, but with a terminal block version.

Why are pins 14-21 and 0-1 red?

Outside of the power pins being red, pins 0, 1 &14-21 are for serial communications pins (Tx & Rx) and that's all they can do.

How do you wire external power to this board? most hats have a jumper to select mega power or external power with dedicated power inputs.

There are several terminals for 3.3 and 5 volt connections. There are also terminals for GND. You can hook up whichever power you want. If you use the barrel connector the terminals will have Mega power on them. If you use an external supply that will power the Mega.

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🔧 Elevate your Arduino setup with pro-grade connectivity!

FR 4 DUAL LAYER PCB - Premium fiberglass board with dual copper layers for enhanced durability and signal integrity.
ROBUST M 2 STEEL SCREWS - Durable fastening ensures stable, long-lasting electrical contacts.
WIDE WIRE COMPATIBILITY - Supports 26 to 16 AWG wires, perfect for versatile Arduino projects.
INTEGRATED POWER LED INDICATOR - Instant visual confirmation of power status to keep your build on track.
PRECISION 3 5 MM TERMINAL PITCH - Optimized for secure, reliable connections with standard wiring.

The Electronics-Salon Screw Terminal Block Breakout Module is a precision-engineered accessory designed for Arduino MEGA-2560 R3. Featuring a 3.5mm terminal pitch, it supports a broad wire gauge range (26-16 AWG) secured by durable M2 steel screws. The module includes a power-on LED for real-time status and is built on a robust FR-4 dual-layer fiberglass PCB, ensuring reliable, professional-grade connections for advanced prototyping and development.

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Manufacturer	Electronics-Salon
Part number	MD-D1236-1
Item Weight	100 g
Package Dimensions	12.09 x 8.1 x 3.4 cm; 100 g
Item model number	MD-D1236-1
Colour	Green
Material	Copper
Item Package Quantity	1
Teeth Per Inch	0.14 Millimetres
Plug profile	PCB Mount
Batteries included?	No
Batteries Required?	No

Electronics-Salon Screw Terminal Block Breakout Module, for Arduino MEGA-2560 R3.

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