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USB pinout
- Thread starter MarvO1
- Start date
I found several with Google:
One link on pinouts:
Jim
One link on pinouts:
Jim
I found this info on the USB
Pin 1 Red V BUS (5V)
2 White D
3 Green D+
4 Black Ground
5 Joined to pin 4 inside the A plug of a Mini USB cable
Opening facing you contacts down.
The electrical design of USB limits the maximum cable length to 5 metres for full-speed devices and up to 3 metres for low-speed devices. Up to 5 hubs can be connected in series to allow for an extended cable run and up to 127 devices (theoretical limit) can be attached to a single host computer. The hot-swap capability allows a USB device to be plugged in or unplugged without turning the system off. USB devices may be plugged into a USB socket on the PC, into a multi-port USB hub or into a USB device that also functions as a hub for other devices.
The USB 1.1 maximum bandwidth of 12 Mbits/sec is equivalent to a data transfer speed of 1.5 Mbytes/sec with USB 2.0 dramatically increasing this to 480 Mbits/sec.
The USB bus supplies 5V DC regulated power (maximum 500mA) through each port on pins 1 and 4. Low-power devices that might normally require a separate AC adapter can therefore be powered via the USB cable, eliminating the need for associated AC adaptors. Bus-powered hubs derive all their power from the USB bus. Powered-hubs are powered from their own AC adapter and provide better power distribution to downstream devices. Port-switching USB hubs isolate all ports from each other so that a faulty device will not cause all other the devices on the same bus to also fail.
Standard USB plugs and sockets have 4-contacts. Standard USB Type A plugs & sockets are rectangular in shape, with the contact opening measuring 13.1(W) x 5.5(H) mm. The contact opening on standard Type B USB plugs and sockets measures approximately 5.6(W) x 3.2(H)mm.
MINI USB plugs and sockets have 5 contacts with contacts 4 & 5 joined together inside the A plug. The Mini Type A and Mini Type B plugs & sockets are both rectangular in shape, with the contact opening measuring approximately 6.8(W) x 3.1(H) mm. Mini USB cables are also used for USB OTG (Universal Serial Bus On The Go) devices.
.
Steve
tele-dataservices.com
Pin 1 Red V BUS (5V)
2 White D
3 Green D+
4 Black Ground
5 Joined to pin 4 inside the A plug of a Mini USB cable
Opening facing you contacts down.
The electrical design of USB limits the maximum cable length to 5 metres for full-speed devices and up to 3 metres for low-speed devices. Up to 5 hubs can be connected in series to allow for an extended cable run and up to 127 devices (theoretical limit) can be attached to a single host computer. The hot-swap capability allows a USB device to be plugged in or unplugged without turning the system off. USB devices may be plugged into a USB socket on the PC, into a multi-port USB hub or into a USB device that also functions as a hub for other devices.
The USB 1.1 maximum bandwidth of 12 Mbits/sec is equivalent to a data transfer speed of 1.5 Mbytes/sec with USB 2.0 dramatically increasing this to 480 Mbits/sec.
The USB bus supplies 5V DC regulated power (maximum 500mA) through each port on pins 1 and 4. Low-power devices that might normally require a separate AC adapter can therefore be powered via the USB cable, eliminating the need for associated AC adaptors. Bus-powered hubs derive all their power from the USB bus. Powered-hubs are powered from their own AC adapter and provide better power distribution to downstream devices. Port-switching USB hubs isolate all ports from each other so that a faulty device will not cause all other the devices on the same bus to also fail.
Standard USB plugs and sockets have 4-contacts. Standard USB Type A plugs & sockets are rectangular in shape, with the contact opening measuring 13.1(W) x 5.5(H) mm. The contact opening on standard Type B USB plugs and sockets measures approximately 5.6(W) x 3.2(H)mm.
MINI USB plugs and sockets have 5 contacts with contacts 4 & 5 joined together inside the A plug. The Mini Type A and Mini Type B plugs & sockets are both rectangular in shape, with the contact opening measuring approximately 6.8(W) x 3.1(H) mm. Mini USB cables are also used for USB OTG (Universal Serial Bus On The Go) devices.
.
Steve
tele-dataservices.com
Most devices of this type that you see (like the sewelldirect.com link above) are used to add a RS-232 serial port to a PC. They will not support converting back to connect a USB device like a camera, scanner or the like.
If you want to make your own then buy some Male to Male USB cables and some DB-9 connectors and roll your own. Cut the USB cable in half and solder to the DB-9. Since there is no standard as to pinout on the DB-9 then just make up your own. Be aware that there is a fair amount of current available (1/2 amp) so be careful not to mix things up.
Be aware that USB data rates are fairly high so the capacitance of the serial cables may muck things up.
If you decide to do this please let us know how it turns out.
If you want to make your own then buy some Male to Male USB cables and some DB-9 connectors and roll your own. Cut the USB cable in half and solder to the DB-9. Since there is no standard as to pinout on the DB-9 then just make up your own. Be aware that there is a fair amount of current available (1/2 amp) so be careful not to mix things up.
Be aware that USB data rates are fairly high so the capacitance of the serial cables may muck things up.
If you decide to do this please let us know how it turns out.
franklin97355
Technical User
There are conversion devices and logic in those cables(USB to Serial). It's not just wire.
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