The Arduino RS232 Shield seamlessly converts UART to RS232, integrating DB9 connectors for easy connection to devices with RS232 interfaces. Compatible with most Arduino controllers like Uno, Mega, and Leonardo, this shield supports prototyping with its additional welding areas and features a convenient run/program mode switch.

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1. Example Code for Arduino-RS232 Communication Test

This article explains how to conduct a communication test between Arduino microcontrollers and RS232 devices using an RS232 shield and a USB-RS232 converter. It includes detailed hardware and software preparation, wiring diagrams, and a sample code for toggling an LED based on received serial data.

Specification

Parameter Item	Specification
Supply Voltage	+5V
Digital I/O Ports	16 Digital I/O Ports (including 1x I2C Interface)
Analog I/O & Power Interfaces	6 Analog I/O Ports + Power Supply Pins
Switch	An operation and programming mode switch A Reset Switch
Indicators	A Pair Of Transceiver Status LED
Communication Connectors	DB9 Female Connector (RS232 Pinout Compatible)
Prototyping Area	A Weldable Prototyping Area
Reset Function	Hardware Reset Switch
Overall Dimensions	55mm × 53mm (2.16" × 2.08")

Pinout

DB9 Female Pin Definition
P2	TXD
P3	RXD
P5	GND

Run/Program Mode Switch
OFF	Download programs for Arduino
ON	Convert Arduino Microcontroller's UART to RS232 Interface

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