How the indicator led tell you is ok or not

Please use the following link, it has all the information on the operation, single page easy reference and description of the lamps and how the display of lit, not lit, and color of the LED is interpreted.http://serialstuff.amazonwebstore.com/CableMax-RS232-LED-link-Tester-DB9/M/B004OT995U.htm

Are there simply LEDs connected to the lines, or does it have one shot circuitry to make the LEDs stay on for a bit even with a short pulse?

There is no one-shot dwell circuit, but the LEDs are two-color so you can see signal levels even when they're asserted false/space.

Will this device show if the PC serial port is working properly, or does it have to be plugged in between the pc and a device, such as a printer?

it needs to be plugged in between the pc and a device. it will indicate comunication between the two on each of the pins of the rs-232.

Is it possible to test db25 connections with this device? Maybe with an adapter,?

Yes, you will need a DB25 Male to DB9 female adapter. If you want to test online then you would also need a DB9 Male to a DB25 female adapter.

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⚡ Diagnose your serial signals in a flash—because downtime is so last decade!

CROSS PLATFORM READY - Compatible with Windows, Linux, and macOS, so your workflow stays uninterrupted across systems.
INSTANT SIGNAL INSIGHT - Dual-color LEDs provide real-time, pin-by-pin RS-232 status for lightning-fast troubleshooting.
PLUG PLAY SIMPLICITY - No drivers or setup—just connect and start monitoring your serial communication immediately.
POWER FREE PORTABILITY - Operates without external power, perfect for on-the-go diagnostics in any environment.
UNIVERSAL SERIAL COMPATIBILITY - Works seamlessly with any male or female DB-9 RS-232 port, ensuring broad device support.

The RS-232 LED Link Signal Tester is a compact, plug-and-play device designed for instant diagnostics of DB-9 serial connections. Featuring dual-color LEDs for each pin, it provides real-time monitoring of RS-232 signal activity without requiring external power. Compatible across major operating systems and all standard 9-pin RS-232 ports, it’s the essential tool for professionals needing quick, reliable serial communication troubleshooting.

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Finish Types	Plastic
Color	Black
Warranty Type	Limited
Unit Count	1.0 Count
Number of Items	1
Item Weight	0.11 Pounds
Package Quantity	1
Item Dimensions	5 x 2.5 x 0.8 inches
Connector Type Used on Cable	DB-9
Number of Ports	1
Compatible Devices	Monitor
Specific Uses For Product	Monitor

RS-232 LED Link Signal Tester - DB-9 Male to DB-9 Female Connections for Serial Communication Monitoring

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