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

Q: 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/

Q: 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.

Q: 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.

Q: 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.

Product ID: 454897132

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Details

Current Rating
16 Amps
Item Pitch
0.14
Connector Type
Screw
Number Of Contacts
12
Mounting Type
PCB Mount

⚡16A current rating powerhouse

💡Power-on LED status indicator

🔧3.5mm pitch precision screw terminals

Description

⚡ Power your Arduino MEGA like a pro—connect, control, conquer!

INTEGRATED POWER ON LED - Instant visual confirmation of module status—no guesswork needed.
DURABLE FR 4 DUAL LAYER PCB - Premium fiberglass board with dual copper layers for enhanced signal integrity.
ROBUST 16 A CURRENT CAPACITY - Handles high loads with ease for demanding Arduino projects.
PRECISION 3 5 MM TERMINAL PITCH - Ensures secure, reliable wire connections from 26AWG to 16AWG.
CONVENIENT RESET BUTTON ICSP HEADER - Streamline your debugging and programming workflow effortlessly.

The Electronics-Salon Screw Terminal Block Breakout Module is a pre-assembled, high-quality interface designed specifically for the Arduino MEGA-2560 R3. Featuring 24 poles with 3.5mm pitch screw terminals supporting wire sizes from 26AWG to 16AWG, it delivers a robust 16A current rating. Built on a durable FR-4 fiberglass PCB with dual copper layers, it includes a power-on LED indicator, a red reset button, and an ICSP adapter header to enhance your prototyping and development experience. Note: Arduino MEGA board not included.

Specifications

Current Rating	16 Amps
Item Pitch	0.14 Millimeters
Connector Type	Screw
Number Of Contacts	12
Mounting Type	PCB Mount
Material	Koper
Colour	Green
Brand	Electronics-Salon
Number Of Poles	24
Manufacturer	Electronics-Salon
Country of Origin	USA
Model number	MD-D1236-1
Number of Memory Sticks	1
Item Weight	100 g
Package Dimensions	12.09 x 8.1 x 3.4 cm; 100 g
Item model number	MD-D1236-1
Are batteries included?	No