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

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Purchase options and add-ons

Compatible Devices	Devices with RS-232 DB9 female serial ports such as printers, modems, CNS machines, PLCs, radios, etc. See more
Specific Uses For Product	Monitor
Connector Type	DB-9
Color	Black
Item dimensions L x W x H	1.77 x 1.38 x 0.82 inches

About this item

[ Instant Diagnostics ] : Quickly test COM port function & verify RS-232 signal activity with dual-color LED indicators on each pin for easy troubleshooting.
[ Universal Compatibility ] : Works with any male or female 9-pin RS-232 serial connection, supporting DB-9 Serial configurations.
[ No External Power Required ] : Operates without external power - ideal for field work, portable kits, or low-resource environments.
[ Plug & Play Installation ] : No drivers or setup needed - just connect and begin testing immediately.
[ Quick Status Monitoring ] : LED indicators flash to signal the direction of data flow, allowing easy real-time monitoring.
[ Broad OS Support ] : Compatible with Windows 11, 10, 8, 7, Linux, and macOS for flexible deployment across platforms.

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Product information

Product Dimensions	1.77 x 1.38 x 0.82 inches
Item Weight	1 ounces
Manufacturer	Cablemax
ASIN	B004OT995U
Item model number	DB9-TERS
Best Sellers Rank	#55 in Serial Adapters #4,998 in Computer Cables & Interconnects
Is Discontinued By Manufacturer	No
Date First Available	February 21, 2011

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Product description

RS-232 LED link Tester

Introduction

The DB9 Tester is the easiest way for you to test the connection on any male or female 9 Pin Serial connections. This adapter allows you to monitor the status of your connections by marking them with LEDS, which flash when there is activity on the pins. This device is easy to install, it features a Plug & Play Easy test RS-232 Host to Device link.

Features

Standard RS-232 DTE & DCE Interface with DB-9 / F & DB-9 / M Connectors.
RS-232 DB-9 / DB25 Pin assignment No Power required.
Easy to install , Plug & Play.
Windows 11, 10, 8, 7, Linux, & macOS
Data rate: Up to 200 Kbps

Activity Monitoring LED Array

Double color LEDs are implemented for an easy way to monitor the transferring & receiving of data. Pin Assignment:

Pin1 / Pin8 : DCD IN
Pin2 / Pin3 : RXD IN
Pin3 / Pin2 : TXD OUT
Pin4 / Pin20 : DTR OUT
Pin5 / Pin7 : GND
Pin6 / Pin6 : DSR IN
Pin7 / Pin4 : RTS OUT
Pin8 / Pin5 : CTS IN
Pin9 / Pin22 : RI IN

Easily Portable

With the tester's compact size along with an easy Plug & Play setup, quickly make sure your COM ports are working properly, effortlessly.

Dimensions: 1.77 × 1.38 × 0.82 in. (L × W × H)