--- product_id: 66455383 title: "RJ45 to RS232 Cable, DB9 9-Pin Serial Port Female&Male to RJ45 Female Cat5/6 Ethernet LAN Console（15CM/6Inch） 2Pack" brand: "zdycgtime" price: "$22.51" currency: USD in_stock: true reviews_count: 13 category: "Zdy Cg Time" url: https://www.desertcart.us/products/66455383-rj45-to-rs232-cable-db9-9-pin-serial-port-female store_origin: US region: United States of America --- # No external power needed Pair-only proprietary pinout 15cm compact length RJ45 to RS232 Cable, DB9 9-Pin Serial Port Female&Male to RJ45 Female Cat5/6 Ethernet LAN Console（15CM/6Inch） 2Pack **Brand:** zdycgtime **Price:** $22.51 **Availability:** ✅ In Stock ## Summary > 🔗 Elevate your serial connections—compact, clever, and built for pros who demand seamless control. ## Quick Answers - **What is this?** RJ45 to RS232 Cable, DB9 9-Pin Serial Port Female&Male to RJ45 Female Cat5/6 Ethernet LAN Console（15CM/6Inch） 2Pack by zdycgtime - **How much does it cost?** $22.51 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/66455383-rj45-to-rs232-cable-db9-9-pin-serial-port-female) ## Best For - zdycgtime enthusiasts ## Why This Product - Trusted zdycgtime brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact & Convenient:** 15cm (6 inch) length fits tight spaces and cable bundles with ease. - • **Power-Free Operation:** Requires zero external power, simplifying setup and reducing clutter. - • **Pair-Exclusive Design:** Works only in matched pairs ensuring secure, interference-free communication. - • **Versatile Compatibility:** Connects DB9 9-pin serial ports to RJ45 Ethernet interfaces, perfect for professional console and monitoring setups. - • **Seamless Signal Transmission:** Transmits RS232 signals flawlessly over standard Cat5/6 cables for reliable connectivity. ## Overview The zdyCGTime RJ45 to RS232 Cable set includes a male and female DB9 to RJ45 adapter pair, designed for transmitting RS232 serial signals over Cat5/6 Ethernet cables up to 15 meters without external power. Its proprietary paired design ensures reliable, interference-free communication, making it ideal for engineers and technicians needing compact, efficient serial console connections in professional environments. ## Description Please note: This is not EIA/TIA-561 or similar common pinout. These units can only be used when paired together. They cannot be used as you would any other similar adapter.Can only be used in pairs to work (2 at the same time), can not be used alone, please read the instructions carefully before buying "Product Instructions: 1.DB9 port, which expands display devices through network cables 2. This switch cable can be used to switch to the RS232 serial port. The DB9 9-pin serial port is used to connect a host computer or various monitors. 3. The network cable can be connected to the network cable interface of the two switch cables respectively. 4. The product transfer cable only uses the network cable as the transmission medium, instead of converting the network signal to the DB9 signal. RJ45 to RS232 patch cable Male or female connector transmits DB9 signal via cable. Review: Works as intended with "SEL digital relays" - As a utility relay tester, I often test digital protective relays "Sweitzer's or SELs" in the field, on utility poles out in the middle of nowhere. Using a simple network cable about 10 meters, this adapter set, and the SEL cable, it allows me to stay out of the rain and remote test, interrogate and program from my vehicle if I'm in inclement weather. Not getting my test set and my laptop wet. It's well worth the money. It makes my job easier; I'm less likely to get sick in the weather, damage the test set and/or the laptop. I highly recommend it to any technician or engineer who has to interrogate a digital apparatus with an RS232 9 pin serial com port. I don't see any issue with speed, error check, or performance through the front com port at 9600, 19.2 or even higher. The wiring internally maybe proprietary but I continuity checked it before hooking it into the first comm port and there were no issues, pin for pin straight through and invisible to the apparatus and to the Windows USB port. Works as intended. Review: Perfect product! - I love this converter! I work in a survey industry running cat 5/6 everywhere to to send DB-9 data to a central hub. These are sturdy and work great. I love that one pack comes with a male and a female DB-9 end. The flexible whip is great for tight spaces with lots of cables. I have now bought multiple packs of these after buying one as they are perfect for my job! I have recommended them to my boss for full company use and would absolutely recommend them to anyone looking for the perfect solution for DB-9 to RJ-45 connectors! ## Features - Please note: This is not EIA/TIA-561 or similar common pinout. These units can only be used when paired together. They cannot be used as you would any other similar adapter.Size:(15CM/6Inch) Color: Black Features:（2 per pack) DB9 Female to RJ45 Female cable and DB9 Male to RJ45 female cable - The RS232 signal is transmitted over the network cable,When using this adapter, it is recommended to use within a distance of 1-15 meters - Requires no external power, easy and Convenient to use. - Save money by using a CAT5 cable versus a DB9 cable.Makes running cables easier due to RJ45 being thinner. - Please note:Can only be used in pairs to work (2 at the same time), can not be used alone, please read the instructions carefully before buyingThis cable can be converted to DB9 9-Pin serial port, DB9 port used to connect to the computer host or a variety of monitors ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07DCPVLBC | | Best Sellers Rank | #322 in Serial Cables | | Brand | zdyCGTime | | Color | BLACK | | Customer Reviews | 4.4 4.4 out of 5 stars (324) | | Date First Available | May 29, 2018 | | Is Discontinued By Manufacturer | No | | Item Weight | 2.82 ounces | | Item model number | 8541684836 | | Manufacturer | zdyCGTime | | Package Dimensions | 6.57 x 4.21 x 0.98 inches | | Standing screen display size | 7 Inches | ## Product Details - **Brand:** zdyCGTime - **Connector Type:** RJ45 - **Cable Type:** Ethernet - **Compatible Devices:** Monitor, PC - **Special Feature:** DB9 9-Pin Serial Port Female&Male to RJ45 Female ## Images ![RJ45 to RS232 Cable, DB9 9-Pin Serial Port Female&Male to RJ45 Female Cat5/6 Ethernet LAN Console（15CM/6Inch） 2Pack - Image 1](https://m.media-amazon.com/images/I/81mthDELuNL.jpg) ![RJ45 to RS232 Cable, DB9 9-Pin Serial Port Female&Male to RJ45 Female Cat5/6 Ethernet LAN Console（15CM/6Inch） 2Pack - Image 2](https://m.media-amazon.com/images/I/71V2fegUXTL.jpg) ![RJ45 to RS232 Cable, DB9 9-Pin Serial Port Female&Male to RJ45 Female Cat5/6 Ethernet LAN Console（15CM/6Inch） 2Pack - Image 3](https://m.media-amazon.com/images/I/81I4Cgvwb1L.jpg) ![RJ45 to RS232 Cable, DB9 9-Pin Serial Port Female&Male to RJ45 Female Cat5/6 Ethernet LAN Console（15CM/6Inch） 2Pack - Image 4](https://m.media-amazon.com/images/I/91QujFx16uL.jpg) ![RJ45 to RS232 Cable, DB9 9-Pin Serial Port Female&Male to RJ45 Female Cat5/6 Ethernet LAN Console（15CM/6Inch） 2Pack - Image 5](https://m.media-amazon.com/images/I/81KXAnkO3ZL.jpg) ## Questions & Answers **Q: What is the pin mapping from the rj45 to db9 pins?** A: I'm sorry but I don't know what the pin mapping is. Because they come as a matched pair of adaptors it didn't matter to me. I used one at each end of a standard 25 foot Cat5e patch cable to make a long DB9-Male to DB9-Female cable and it has been working with no problems for over 6 months. I have previously used other similar adaptors and as you probably suspect there is no standardization. That is why this matched set was appealing. **Q: Where is this made? Thank you.** A: Made in China **Q: will this cable convert the signal, so that it can be seen on a computer monitor ?** A: The RJ45 to RS232 cable is not for video. A DSub15 is the standard connector for VGA video. RS232 is a serial data standard. **Q: Will this work with any usb-rj45 cable with your adapter? so far i cannot get it to work. my cable usb-rj45 works fine, but this doesn't. any ideas** A: Your question does not make any sense in this context. You say your "cable USB-RJ45 works fine" but you asked this about an RJ45 to RS-232 adaptor. Why would you even expect it to work? RS-232 and USB have nothing in common. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works as intended with "SEL digital relays" *by T***M on April 13, 2025* As a utility relay tester, I often test digital protective relays "Sweitzer's or SELs" in the field, on utility poles out in the middle of nowhere. Using a simple network cable about 10 meters, this adapter set, and the SEL cable, it allows me to stay out of the rain and remote test, interrogate and program from my vehicle if I'm in inclement weather. Not getting my test set and my laptop wet. It's well worth the money. It makes my job easier; I'm less likely to get sick in the weather, damage the test set and/or the laptop. I highly recommend it to any technician or engineer who has to interrogate a digital apparatus with an RS232 9 pin serial com port. I don't see any issue with speed, error check, or performance through the front com port at 9600, 19.2 or even higher. The wiring internally maybe proprietary but I continuity checked it before hooking it into the first comm port and there were no issues, pin for pin straight through and invisible to the apparatus and to the Windows USB port. Works as intended. ### ⭐⭐⭐⭐⭐ Perfect product! *by R***S on March 1, 2022* I love this converter! I work in a survey industry running cat 5/6 everywhere to to send DB-9 data to a central hub. These are sturdy and work great. I love that one pack comes with a male and a female DB-9 end. The flexible whip is great for tight spaces with lots of cables. I have now bought multiple packs of these after buying one as they are perfect for my job! I have recommended them to my boss for full company use and would absolutely recommend them to anyone looking for the perfect solution for DB-9 to RJ-45 connectors! ### ⭐⭐⭐⭐⭐ Works PERFECTLY as an Ethernet pass-through, 1 Gbps to boot! *by M***T on May 30, 2019* I needed a way to pass Ethernet through a DB9 "pass through" on a shielded test enclosure. This works perfectly and maintains the integrity of the shielded test enclosure (the built-in pass through does that of course, but I wanted to confirm that it did work and it does). I also tested the speed of the connection using a laptop running Windows 10 with a gigabit Ethernet interface and while connected using these two dongles it showed up as a 1 Gbps connection, sweet! ## Frequently Bought Together - zdyCGTime RJ45 to RS232 Cable, DB9 9-Pin Serial Port Female&Male to RJ45 Female Cat5/6 Ethernet LAN Console（15CM/6Inch） 2Pack - USB to RJ45 Console Cable 2pack, Essential Tool for Cisco, NETGEAR, Ubiquiti, LINKSYS, TP-Link Routers/Switches Connection, Compatible with Windows, Mac, Linux Laptops - OIKWAN USB to RS232, USB Serial Adapter with FTDI Chipset,USB 2.0 to Male DB9 Serial Cable for Windows 11,10, 8, 7, Vista, XP, 2000, Linux and Mac OS(6ft)… --- ## 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.us/products/66455383-rj45-to-rs232-cable-db9-9-pin-serial-port-female](https://www.desertcart.us/products/66455383-rj45-to-rs232-cable-db9-9-pin-serial-port-female) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-17*