can i put leds on serial line to show activity? - General Electronics - Arduino Forum
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USB 2.0 RS-232 Serial Adapter with LED Indicators
Laurel Electronics Magna Series Large Digit Display - 4-Digit w/RS232/RS485 Serial Data Input Ram Meter, Inc.
AK-RS232-LED – TTL to RS232 converter with LEDs | Artekit Labs
RS-232 Mini-Tester with LED Indicators DB-25 Male to Female | eBay
ASCII Serial Input LED Digital Display | RS232 | RS485
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Amazon.com: Gearmo USB to RS-232 Serial Adapter w/LED Indicators Windows 11 Support : Electronics
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RS232 to I2C Click
RS232 16x2 Character Module from Crystalfontz
RS232 LED status indicator circuit | Forum for Electronics
USB 2.0 RS-232 Serial Adapter 16 Inches w/ LED Indicators
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EZSync RS232 Mini Tester with LED Indicators, DB9 Male to DB9 Female, EZSync911 – Serial Connections Made Easy
Build your own RS232 adapter with LED indicators - Do It Easy With ScienceProg
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Amazon.com: DTech RS232 to RS485 Converter Serial Communication Data Adapter with TX RX LED Indicators and Terminal Board : Electronics
Circuit-RS232 Data Bus Status Indicator
Serial Port LED flasher | Cedar Lake Instruments
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USB 2.0 RS-232 Serial Adapter with LED Indicators
Relay Module, RS232 Interface Serial Port Remote Control Switch Multifunctional with LED Indicator for Automation for Smart Home(With shell): Amazon.com: Industrial & Scientific