--- 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: "€ 45.02" currency: EUR in_stock: true category: "Cablemax" url: https://www.desertcart.pt/products/3958225-cablemax-rs-232-led-link-signal-tester-db-9-male store_origin: PT region: Portugal --- # 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:** € 45.02 **Availability:** ✅ In Stock ## Summary > ⚡ Diagnose Like a Pro, Anywhere, Anytime! ## 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?** € 45.02 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/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 Support:** Compatible with Windows, Linux, and macOS, ensuring flexible deployment across all your devices. - • **Plug & Play Simplicity:** No drivers or setup required—just connect and start testing immediately, saving you valuable time. - • **Power-Free Portability:** Operates without external power, perfect for fieldwork and on-the-go diagnostics. - • **Instant Visual Diagnostics:** Dual-color LEDs provide real-time signal and data flow status for lightning-fast troubleshooting. - • **Universal RS-232 Compatibility:** Works seamlessly with any male or female DB-9 serial port device, from printers to PLCs. ## Overview The CABLEMAX 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 clear signal and data flow monitoring, it requires no external power and supports universal RS-232 devices across multiple operating systems, making it an essential tool for professionals who demand quick, reliable serial communication troubleshooting. ## Description Buy CABLEMAX RS-232 LED Link Signal Tester - DB-9 Male to DB-9 Female Connections for Serial Communication Monitoring: Cables & Interconnects - desertcart.com ✓ FREE DELIVERY possible on eligible purchases ## 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 ] : This serial tester works with any male or female 9-pin RS-232 serial connection, supporting DB-9 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 | |---------------|-------| | ASIN | B004OT995U | | Best Sellers Rank | #88 in Serial Adapters #6,408 in Computer Cables & Interconnects | | Brand | CABLEMAX | | Color | Black | | Compatible Devices | Devices with RS-232 DB9 female serial ports such as printers, modems, CNS machines, PLCs, radios, etc. Compatible Devices Devices with RS-232 DB9 female serial ports such as printers, modems, CNS machines, PLCs, radios, etc. See more | | Connector Type | DB-9 | | Customer Reviews | 4.6 out of 5 stars 305 Reviews | | Finish | Plastic | | Item Dimensions | 1.77 x 1.38 x 0.82 inches | | Item Weight | 1 ounces | | Item dimensions L x W x H | 1.77 x 1.38 x 0.82 inches | | Manufacturer | Cablemax | | Mfr Part Number | DB9-TERS | | Model Number | DB9-TERS | | Number of Items | 1 | | Number of Ports | 1 | | Package Quantity | 1 | | Specific Uses For Product | Test the connection on male or female 9-Pin serial connections | | UPC | 729440626303 | | Unit Count | 1 Count | | Warranty Description | 1 Year | | Warranty Type | 1 Year | ## Product Details - **Color:** Black - **Connector Type:** DB-9 - **Item dimensions L x W x H:** 1.77 x 1.38 x 0.82 inches - **Specific Uses For Product:** Test the connection on male or female 9-Pin serial connections ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pt/products/3958225-cablemax-rs-232-led-link-signal-tester-db-9-male](https://www.desertcart.pt/products/3958225-cablemax-rs-232-led-link-signal-tester-db-9-male) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-09-17*