What is the pin mapping from the rj45 to db9 pins?

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.

will this cable convert the signal, so that it can be seen on a computer monitor ?

The RJ45 to RS232 cable is not for video. A DSub15 is the standard connector for VGA video. RS232 is a serial data standard.

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

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.

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RJ45 to RS232 Cable, DB9 9-Pin Serial Port Female&Male to RJ45 Female Cat5/6 Ethernet LAN Console（15CM/6Inch） 2Pack

Product ID: 66455383

Details

Brand
zdyCGTime
Connector Type
RJ45
Cable Type
Ethernet
Compatible Devices
Monitor PC
Special Feature
DB9 9-Pin Port

💡No external power needed

🔄Pair-only operation for secure connection

🔌15cm compact length

68.36 DT

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Description

🔗 Connect smarter, not harder — the sleek serial solution for pros on the move!

COMPACT CONVENIENT - 15cm length fits tight spaces and reduces clutter
POWER FREE OPERATION - Zero external power required, plug-and-play simplicity
SLIM RJ 45 CONNECTORS - Thinner cables make routing and installation effortless
PAIR EXCLUSIVE DESIGN - Works only in pairs for guaranteed signal integrity—no guesswork
COST EFFECTIVE CABLING - Leverages affordable CAT5/6 cables instead of bulky DB9 wiring

This 2-pack RJ45 to RS232 cable set features DB9 9-pin serial port connectors designed for paired use only, transmitting RS232 signals over CAT5/6 Ethernet cables up to 15 meters without external power. Its compact 15cm length and slim RJ45 connectors simplify cable management, making it an efficient, cost-saving choice for professional setups requiring reliable serial communication.

Specifications

ASIN	B07DCPVLBC
Best Sellers Rank	#145 in Serial Cables
Brand	zdyCGTime
Color	BLACK
Customer Reviews	4.4 4.4 out of 5 stars (327)
Date First Available	May 29, 2018
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

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68.36 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Zainab N.

Fantastic and great service. Shipping was faster than expected.

1 week ago

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