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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RS-232 LED link Tester DB-9 Male to DB-9 Female

RS-232 LED link Tester DB-9 Male to DB-9 Female

Product ID: 179578451

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Details

Compatible Devices
Devices with
Specific Uses For Product
Monitor
Connector Type
DB-9
Color
Black
Item dimensions L x W x H
1.77 x 1.38 x

⚡No Power Needed

💻OS Compatibility

🔌Plug & Play

Description

🔗 Connect with Confidence!

NO POWER REQUIRED - Enjoy hassle-free operation without the need for external power.
PROFESSIONAL GRADE - Engineered for reliability in both DTE and DCE interfaces.
VERSATILE CONNECTORS - Equipped with both DB-9 Male and Female connectors for maximum flexibility.
SEAMLESS CONNECTIVITY - Experience effortless plug-and-play installation.
UNIVERSAL COMPATIBILITY - Works with a wide range of operating systems, from Windows to Mac.

The CableMax® RS-232 LED Link Tester is a versatile connectivity solution featuring DB-9 Male and Female connectors, designed for seamless integration with various operating systems. With no external power required and easy plug-and-play functionality, it’s the perfect tool for professionals seeking reliable communication in their tech setups.

Specifications

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

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