RJ45 wiring diagram on a USB cable
Khamouguinoffn
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f4cpy -
Hello everyone
I would like to make a connection cable on a cable that already has a male USB connector and connect an RJ45 connector because I intend to connect a camera that already has a recessed female RJ45 connector. If you have any idea at least where I should solder the color codes for the power supply of this camera
thank you
I would like to make a connection cable on a cable that already has a male USB connector and connect an RJ45 connector because I intend to connect a camera that already has a recessed female RJ45 connector. If you have any idea at least where I should solder the color codes for the power supply of this camera
thank you
9 réponses
Hello everyone,
here is my problem, I have an electronic chessboard that connects (chessboard side RJ 11 6 wires) and PC side normally through a DB-9 serial port (only 4 wires are used), but my PC only has USB ports. Can we create this cable? One side RJ 11 and the other USB?
Sapphire II Serial Communications Port
Pin 1 = ground
Pin 2 = high (+4V) when power is on
Pin 3 = TX data out
Pin 4 = unused
Pin 5 = RX data in
Pin 6 = unused
IBM-PC Serial Communications Port
(Pins as numbered on the connector)
Pin 8 = CTS
Pin 5 = ground
Pin 3 = TX data out
Pin 2 = RX data in
here is my problem, I have an electronic chessboard that connects (chessboard side RJ 11 6 wires) and PC side normally through a DB-9 serial port (only 4 wires are used), but my PC only has USB ports. Can we create this cable? One side RJ 11 and the other USB?
Sapphire II Serial Communications Port
Pin 1 = ground
Pin 2 = high (+4V) when power is on
Pin 3 = TX data out
Pin 4 = unused
Pin 5 = RX data in
Pin 6 = unused
IBM-PC Serial Communications Port
(Pins as numbered on the connector)
Pin 8 = CTS
Pin 5 = ground
Pin 3 = TX data out
Pin 2 = RX data in
no,
it can't work like that:
the electrical signals of a serial port are not the same as USB and the protocols and speeds are different.
you need to go through a serial/USB adapter: https://www.leguide.com/recherche?mots=Adaptateur%20serie%20usb with the appropriate drivers.
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it can't work like that:
the electrical signals of a serial port are not the same as USB and the protocols and speeds are different.
you need to go through a serial/USB adapter: https://www.leguide.com/recherche?mots=Adaptateur%20serie%20usb with the appropriate drivers.
--
and ... Voila Voilou Voila!
Actually, it's something like this:
https://www.materiel.net/
In my opinion, you just need to connect the two data wires and that's it. We'll see, I'm going to try on my side because I need it too.
PS: on the other hand, don't connect the power supply, I don't think the Ethernet cables would support it.
https://www.materiel.net/
In my opinion, you just need to connect the two data wires and that's it. We'll see, I'm going to try on my side because I need it too.
PS: on the other hand, don't connect the power supply, I don't think the Ethernet cables would support it.
PS: don't connect the power supply, I don't think the ethernet cables would support it.
Are you kidding?
Have you really looked at a USB cable? The wires are 10 times smaller than those in ethernet cables.
If I remember correctly, the USB power supply is limited to 100mA, we should be able to carry at least one ampere on AWG26 cable.
The difference is that USB isn't designed for long distances, not because of the cable, but because of the electrical signals sent.
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Are you kidding?
Have you really looked at a USB cable? The wires are 10 times smaller than those in ethernet cables.
If I remember correctly, the USB power supply is limited to 100mA, we should be able to carry at least one ampere on AWG26 cable.
The difference is that USB isn't designed for long distances, not because of the cable, but because of the electrical signals sent.
--
and ... There you go!
I AM IN THE SAME PROBLEM? I DO HAVE A USB/RJ45/USB ADAPTER
BUT IT ONLY WORKS IF THERE IS VERY LITTLE RJ45 CABLE BETWEEN THE TWO ADAPTERS
SO IT DOESN'T REALLY WORK
DOES ANYONE KNOW A SOLUTION THAT WORKS,,,
???
PIERRE YVES
THANK YOU
BUT IT ONLY WORKS IF THERE IS VERY LITTLE RJ45 CABLE BETWEEN THE TWO ADAPTERS
SO IT DOESN'T REALLY WORK
DOES ANYONE KNOW A SOLUTION THAT WORKS,,,
???
PIERRE YVES
THANK YOU
Hello
The USB cable connection cannot exceed 3m (due to signal propagation time..., see USB standard)
Faced with the same distance problem, I bought on a well-known auction site, a USB extension device using an RJ45 cable:
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=280363660185&ssPageName=STRK:MEWAX:IT
I'm not advertising, other devices must work...
The initial tests I conducted have a range of 10m with a CAT5 cable and a WIFI interface on the other end.
The system is stable and works correctly.
Beyond that, it's "no signal" not a single signal.
I will do the same thing but with a CAT6 cable (hoping it will work!!).
In my opinion, 50m is highly unlikely (the interface is rated for 150 feet), I haven't checked the signal at the end of the line.
The interfaces likely use modem circuits from FTDI that convert USB to another standard (RS232, current loop...), for longer distances, it is highly probable that signal amplifier repeaters will be required.
Didier
The USB cable connection cannot exceed 3m (due to signal propagation time..., see USB standard)
Faced with the same distance problem, I bought on a well-known auction site, a USB extension device using an RJ45 cable:
http://cgi.ebay.fr/ws/eBayISAPI.dll?ViewItem&item=280363660185&ssPageName=STRK:MEWAX:IT
I'm not advertising, other devices must work...
The initial tests I conducted have a range of 10m with a CAT5 cable and a WIFI interface on the other end.
The system is stable and works correctly.
Beyond that, it's "no signal" not a single signal.
I will do the same thing but with a CAT6 cable (hoping it will work!!).
In my opinion, 50m is highly unlikely (the interface is rated for 150 feet), I haven't checked the signal at the end of the line.
The interfaces likely use modem circuits from FTDI that convert USB to another standard (RS232, current loop...), for longer distances, it is highly probable that signal amplifier repeaters will be required.
Didier
--
And ... There you go!
Male USB <-----> Female RJ45: RJ45 cable: Female RJ45 <------> Female USB where we can plug in.
This allows to reach a distance of 50 meters. The connection exists commercially but is a bit expensive, and I was wondering if by connecting the VCC of the USB to pins 4 and 5 of the RJ45; the ground of the USB to pins 7 and 8 of the RJ45; the data+ cable of the USB (maybe to TD+ and RD+ of the RJ45) and the data- cable (maybe to TD- and RD- of the RJ45) it could work.... USB operates in half duplex, so it does not need one cable for transmission and one for reception; transfers are done over the same cable.
I don't understand why the USB extender is limited to 25 meters with 5meter long USB cables while with an RJ45 you can go up to 100 meters. It seemed to me that the problem was due to a transmission delay of less than 70ns. It seems to me that the RJ45 cable, unlike USB, attenuates the signal less; that's why we don't need a repeater, but that still doesn't solve the delay since both cables transfer at the same speed??
it's the transmission mode in this cable: ethernet 10/100/1000/10000 Mbit/s
USB was not designed for long distances, you should forget it in this role.
--
and ... there you go!
Why does the Ethernet cable allow for 100 meters when USB is limited to 5 meters?
it's not a cable issue,
it's a question of the level of electrical signals and processing/filtering in the controlling chips.
ethernet is built for this, usb is not.
--
and ... here you go here you go here you go!