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

🔄RS232 signal over RJ45

🔌15CM compact length

€ 19.53

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Streamline your serial connections with sleek RJ45 power!

COMPACT 15 CM DESIGN - Perfectly sized for tight setups and clutter-free desks.
PAIR ONLY FUNCTIONALITY - Designed to work exclusively in pairs for reliable, interference-free communication.
PLUG PLAY CONVENIENCE - No external power or drivers required—just connect and go.
SEAMLESS RS 232 OVER ETHERNET - Transmit serial signals effortlessly via standard Cat5/6 cables.
COST EFFECTIVE CABLE SOLUTION - Save money by replacing bulky DB9 cables with slim RJ45 Ethernet lines.

This 2-pack RJ45 to RS232 cable set features 15CM DB9 male and female connectors transmitting RS232 signals over Cat5/6 Ethernet cables without external power. Ideal for professional setups requiring compact, cost-effective serial communication, these cables must be used in pairs and support distances up to 15 meters.

Specifications

ASIN	B07DCPVLBC
Best Sellers Rank	#67 in Serial Cables
Brand	zdyCGTime
Color	BLACK
Customer Reviews	4.4 4.4 out of 5 stars (327)
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

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