--- product_id: 226881095 title: "RS232 Breakout Tester LED Monitor, DB9 Male to Female Breakout Module" brand: "oono" price: "28800CFA" currency: XOF in_stock: true reviews_count: 13 category: "Oono" url: https://www.desertcart.sn/products/226881095-rs232-breakout-tester-led-monitor-db9-male-to-female-breakout store_origin: SN region: Senegal --- # DB9 Male to Female plug & play, no drivers DIP switch configurable signal disconnect/reconnect 8 dual-color LEDs for instant logic state RS232 Breakout Tester LED Monitor, DB9 Male to Female Breakout Module **Brand:** oono **Price:** 28800CFA **Availability:** βœ… In Stock ## Summary > πŸ” See Your Serial Signals Like Never Before β€” Don’t Debug in the Dark! ## Quick Answers - **What is this?** RS232 Breakout Tester LED Monitor, DB9 Male to Female Breakout Module by oono - **How much does it cost?** 28800CFA with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/226881095-rs232-breakout-tester-led-monitor-db9-male-to-female-breakout) ## Best For - oono enthusiasts ## Why This Product - Trusted oono brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Plug & Play Simplicity:** No external power or drivers required; just connect and start testing immediately. - β€’ **Universal Compatibility:** Works seamlessly across Windows (98 to 8), Linux, and Mac OS for versatile professional use. - β€’ **Instant Visual Debugging:** 8 dual-color LEDs (red/green) show real-time RS-232 signal statesβ€”no oscilloscope needed. - β€’ **Compact & Adaptable Design:** Easily unscrew jack sockets to mate with other connectors, fitting into any testing setup. - β€’ **Customizable Signal Control:** DIP switches let you disconnect or reconnect any RS-232 line on the fly for precise diagnostics. ## Overview The OONO RS232 Breakout Tester LED Monitor is a compact, driver-free DB9 male-to-female module that visually displays all 8 RS-232 signal lines with dual-color LEDs. Designed for professionals needing quick, reliable serial interface diagnostics, it features DIP switch control for signal isolation and supports broad OS compatibility, making it an essential tool for efficient serial communication troubleshooting. ## Description RS232 Breakout Tester LED Monitor, DB9 Male to Female Breakout Module: desertcart.com: Industrial & Scientific Review: Works great - This device works great for observing and debugging RS-232 stuff. Some folks complain about the test points not accepting dupont cables, they're sized for resistor leads, some breadboard cables (with round pins) and non-stacking arduino headers will also plug into them for use with dupont connector if needed (non stacking means the standard headers you'd find on arduino UNO, not the ones with long pins used on shields). They used the round socket strips because they had the same height as the dip switches. Photo shows RS-232 reconfigured with 10ohm resistors as an Agilent crossover cable, which solved the problem I got it to solve. The case was too bulky to plug directly into the back of my Agilent 34401A, so I used a stack of gender changers to get clearance. Review: Handy little tool - It works very well. Use 22AWG solid wire. 24AWG works as well, but I find it a little sloppy. 22AWG fits perfectly and snug. Some people complain about the upside down DB9s - I say: β€œSo what?”. It’s a great little tool. The photo shows a typical null modem configuration. ## Features - Connect in series with any RS-232 interface for testing a serial RS-232 data link. Simple and easy, no oscilloscope is needed. DIP switch can setting disconnect or reconnect any signal, and support external probe test signal from male or female position. - 8 double-color (red and green) LEDs indicate the logic states for respective data lines. Green for logic HIGH and red for logic LOW. Full RS232 spec compliant with LEDs for all 8 signals: DCD, RXD, TXD, DTR, DSR, RTS, CTS, RI. - No external power required. No driver required. Plug and play. Jack sockets(nuts) on the tester can be unscrewed easily(with metal shell held in place) if needed to mate with another connector that has jack sockets. - OS Compatibility: Windows 98, Me, XP, 2000, 2003, CE, Vista, Windows 7, and Windows 8 as well as Linux and Mac OS 10.X, ect. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08CDQ76Q8 | | Best Sellers Rank | #37,813 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #71 in Network & Cable Testers | | Brand | OONO | | Brand Name | OONO | | Color | Green,Red | | Compatible Devices | Devices with RS-232 serial communication interface | | Customer Reviews | 4.6 out of 5 stars 222 Reviews | | Included Components | no | | Item Weight | 0.27 g | | Manufacturer | CZH-LABS | | Model | OONO-F1023 | | Number of Items | 1 | | Number of Packs | 1 | | Part Number | OONO F-1023 | | Power Source | Corded Electric | | Specification Met | Rs232 | | Style | DB9 MF | | Style Name | DB9 MF | | Unit Count | 1 Count | ## Product Details - **Brand:** OONO - **Color:** Green,Red - **Item Weight:** 0.27 g - **Power Source:** Corded Electric - **Style:** DB9 MF ## Images ![RS232 Breakout Tester LED Monitor, DB9 Male to Female Breakout Module - Image 1](https://m.media-amazon.com/images/I/817MJdiV2DL.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works great *by J***H on June 26, 2023* This device works great for observing and debugging RS-232 stuff. Some folks complain about the test points not accepting dupont cables, they're sized for resistor leads, some breadboard cables (with round pins) and non-stacking arduino headers will also plug into them for use with dupont connector if needed (non stacking means the standard headers you'd find on arduino UNO, not the ones with long pins used on shields). They used the round socket strips because they had the same height as the dip switches. Photo shows RS-232 reconfigured with 10ohm resistors as an Agilent crossover cable, which solved the problem I got it to solve. The case was too bulky to plug directly into the back of my Agilent 34401A, so I used a stack of gender changers to get clearance. ### ⭐⭐⭐⭐⭐ Handy little tool *by M***I on March 15, 2024* It works very well. Use 22AWG solid wire. 24AWG works as well, but I find it a little sloppy. 22AWG fits perfectly and snug. Some people complain about the upside down DB9s - I say: β€œSo what?”. It’s a great little tool. The photo shows a typical null modem configuration. ### ⭐⭐⭐⭐ almost perfect *by A***Z on February 12, 2026* gets the job done, but LEDs end up being on the bottom when plugged into a laptop with DB port in standard orientation. This makes it hard to see the LEDs with laptop on desk. I bought this to troubleshoot cables and needed to see signals as seen by laptop port. One needs a straight-through extension adapter to be able to flip this device and see LEDs. I wish LEDs were mounted such that they could be seen when plugged straight in. ## Frequently Bought Together - 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 - CABLEMAX RS-232 LED Link Tester DB-9 Male to DB-9 Female --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.sn/products/226881095-rs232-breakout-tester-led-monitor-db9-male-to-female-breakout](https://www.desertcart.sn/products/226881095-rs232-breakout-tester-led-monitor-db9-male-to-female-breakout) --- *Product available on Desertcart Senegal* *Store origin: SN* *Last updated: 2026-09-14*