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

Product ID: 258003546

Details

Item pitch
3.5
Connector type
Screw
Mounting type
PCB Mount
Material
Copper
Colour
Green

💡Power LED indicator

🔌3.5mm pitch

⚙️26-16 AWG wire

Description

🔗 Connect, Create, Conquer!

🔄 RESET WITH EASE - Convenient red reset button for quick troubleshooting.
🔋 POWER ON INDICATOR - LED light ensures you're always in the know.
📏 PRECISION ENGINEERING - FR-4 fiberglass PCB with dual copper layers for durability.
🔧 EFFORTLESS CONNECTIVITY - Soldered and assembled for immediate use.
🛠️ VERSATILE COMPATIBILITY - Designed specifically for Arduino MEGA-2560 R3.

The Electronics-Salon Screw Terminal Block Breakout Module is a pre-assembled, high-quality terminal block designed for seamless integration with the Arduino MEGA-2560 R3. Featuring a 3.5mm pitch, it accommodates wire sizes from 26AWG to 16AWG, ensuring versatility in your projects. The module includes a power-on LED indicator and a convenient reset button, all built on a robust FR-4 fiberglass PCB with dual copper layers for enhanced performance.

Specifications

ASIN	B07H9TJCWN
Best Sellers Rank	#47,045 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #55 in Ground Circuit Terminal Blocks
Brand Name	Electronics-Salon
Color	Green
Connector Type	Screw
Customer Reviews	4.6 out of 5 stars 235 Reviews
Gauge	26.0
Item Pitch	0.14 Millimeters
Manufacturer	Electronics-Salon
Material	Copper
Material Type	Copper
Model	MD-D1236-1
Mounting Type	PCB Mount
Number Of Contacts	1
Number Of Poles	24
Number of Positions	12
Part Number	MD-D1236-1
Pitch	0.14 Millimeters

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