NEW PRODUCT – Adafruit RS232 Pal – Two Channel UART to RS-232 Level Shifters – MAX3232E

5987 iso ORIG 2024 07

NEW PRODUCT – Adafruit RS232 Pal – Two Channel UART to RS-232 Level Shifters – MAX3232E


If you’re looking to interface with telco, retro, or industrial equipment, you’ll probably run into RS-232 interfaces. The Adafruit RS232 Pal – Two Channel UART to RS-232 Level Shifters is your friend in such cases, giving you two duplex channels of level shifting and taking care of the high/negative voltage generation, all in a low-cost breakout board. We use the trusty MAX3232E, a classic chip that is part of the MAX232 lineage, so you know it will work great for all your RS-232 needs, up to 250Kbps.

RS-232 is what we had before USB: a 9 or 25-pin D-Sub connector that would allow data plus flow control lines. Many folks may remember these interfaces were used for mice, modems, barcode scanners, tele-types and more. We still find devices sold that have RS-232 ports, although many folks use a USB to RS-232 adapter these days.

If you want to use a microcontroller or microcomputer to chat with a RS-232 then thankfully all you need is a serial port / UART (something just about any microcontroller has) and a level shifter. The level shifter is required because while most UARTs are 0-3.3V or 0-5V logic level, RS-232 requires +-6 to +-10V, yep the signal voltage goes negative! That means a specialized shifter is required to generate extra high and low voltages and safely convert the logic levels.

Sure you could buy a raw MAX232 chip and wire up the necessary capacitors, but this board does it all for you plus it can run on 3.3V power and logic, which many older chips can’t do. It also can do 2 duplex channels, so you can have both RX and TX plus two flow control pins like RTS and CTS.

This breakout comes fully assembled with a UART side for low-voltage power/logic level and an RS-232 side for high-voltage signals, plus the doubled and negative-voltage rails in case you need to reference them. We also include a bit of header so you can solder it to a breadboard in a few minutes.

5987 kit ORIG 2024 07

5987 top 02 ORIG 2024 07

5987 quarter ORIG 2024 07


Adafruit publishes a wide range of writing and video content, including interviews and reporting on the maker market and the wider technology world. Our standards page is intended as a guide to best practices that Adafruit uses, as well as an outline of the ethical standards Adafruit aspires to. While Adafruit is not an independent journalistic institution, Adafruit strives to be a fair, informative, and positive voice within the community – check it out here: adafruit.com/editorialstandards

Join Adafruit on Mastodon

Adafruit is on Mastodon, join in! adafruit.com/mastodon

Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.

Have an amazing project to share? The Electronics Show and Tell is every Wednesday at 7pm ET! To join, head over to YouTube and check out the show’s live chat – we’ll post the link there.

Join us every Wednesday night at 8pm ET for Ask an Engineer!

Join over 36,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

CircuitPython – The easiest way to program microcontrollers – CircuitPython.org


Maker Business — “Packaging” chips in the US

Wearables — Enclosures help fight body humidity in costumes

Electronics — Transformers: More than meets the eye!

Python for Microcontrollers — Python on Microcontrollers Newsletter: Silicon Labs introduces CircuitPython support, and more! #CircuitPython #Python #micropython @ThePSF @Raspberry_Pi

Adafruit IoT Monthly — Guardian Robot, Weather-wise Umbrella Stand, and more!

Microsoft MakeCode — MakeCode Thank You!

EYE on NPI — Maxim’s Himalaya uSLIC Step-Down Power Module #EyeOnNPI @maximintegrated @digikey

New Products – Adafruit Industries – Makers, hackers, artists, designers and engineers! — #NewProds 7/19/23 Feat. Adafruit Matrix Portal S3 CircuitPython Powered Internet Display!

Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



No Comments

No comments yet.


Leave a comment

Adafruit has a "be excellent to each other" comment policy. Help us keep the community here positive and helpful. Stick to the topic, be respectful of makers of all ages and skill levels. Be kind, and don't spam - Thank you!

Prove you are human by reading this resistor:

0Ω+/- 5%

0
0
1
2
3
4
5
6
7
8
9

0
0
1
2
3
4
5
6
7
8
9

0
0
1
2
3
4
5
6
7
8
9

5
5
10

Prove you are human by reading this resistor:


Click/tap drag the number in the circle of each slider on the left to the matching color band on the resistor.

Can't view resistor colors? Don't worry! Just type your comment and hit submit without moving the sliders. Our moderators will review and approve in a jiffy.

Click Here for a new resistor image.

New to electronics? Click here to learn how to read resistor values.

Or learn to read resistors by playing Mho's Resistance!