---
product_id: 3958225
title: "CABLEMAX RS-232 LED Link Signal Tester - DB-9 Male to DB-9 Female Connections for Serial Communication Monitoring"
brand: "cablemax"
price: "$79"
currency: NZD
in_stock: true
url: https://www.desertcart.nz/products/3958225-cablemax-rs-232-led-link-signal-tester-db-9-male
store_origin: NZ
region: New Zealand
---

# Instant dual-color LED diagnostics No external power needed Universal DB-9 RS-232 compatibility CABLEMAX RS-232 LED Link Signal Tester - DB-9 Male to DB-9 Female Connections for Serial Communication Monitoring

**Brand:** cablemax
**Price:** $79
**Availability:** ✅ In Stock

## Summary

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

## Quick Answers

- **What is this?** CABLEMAX RS-232 LED Link Signal Tester - DB-9 Male to DB-9 Female Connections for Serial Communication Monitoring by cablemax
- **How much does it cost?** $79 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/3958225-cablemax-rs-232-led-link-signal-tester-db-9-male)

## Best For

- cablemax enthusiasts

## Why This Product

- Trusted cablemax brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **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.

## Overview

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.

## Description

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

## Features

- [ 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.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| 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 |

## Product Details

- **Compatible Devices:** Devices with RS-232 DB9 female serial ports such as printers, modems, CNS machines, PLCs, radios, etc.
- **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

## Images

![CABLEMAX RS-232 LED Link Signal Tester - DB-9 Male to DB-9 Female Connections for Serial Communication Monitoring - Image 1](https://m.media-amazon.com/images/I/61FCttfCyxL.jpg)

## Questions & Answers

**Q: How the indicator led tell you is ok or not**
A: 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

**Q: 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?**
A: 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.

**Q: 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?**
A: 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.

**Q: Is it possible to test db25 connections with this device? Maybe with an adapter,?**
A: 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.

## Frequently Bought Together

- CABLEMAX RS-232 LED Link Tester DB-9 Male to DB-9 Female
- RS232 Breakout Tester LED Monitor, DB9 Male to Female Breakout Module
- DB9 null modem male to female slimline data transfer serial port adapter 2 Pack

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-03-10*