Only the wire connected to ground will have a resistance close to zero ohms. If you have got another serial cable and you got a multimeter you can easily find out which of the wires is connected to ground by measuring the resistance between each wire and the outer metal shield of the usb connector of the cable. When using the serial cable mentioned above, the blue wire is the ground wire (GND), the green wire is the receive wire (RX) and the white wire is the send wire (TX). To build a universal serial cable that can easily be used on different devices I decided to use test hooks for the serial connection instead of a connector suitable only for the Dockstar's serial connector. Pl2303: Prolific PL2303 USB to serial adaptor driver Usbcore: registered new interface driver pl2303 Usb 4-5: pl2303 converter now attached to ttyUSB0 This cable comes with the very common PL2303 usb serial converter. Lots older mobile phones have a serial port built-in instead of the now common USB device ports.Ī suitable cable for this purpose is a DKU-5 data cable. While such a circuit is rather easy to build, there is an even simpler solution which has the advantage of also being usable on computers without a serial port.Īll that is needed is a data cable used for certain older mobile phones. To connect such a device to a PC and its standard serial port, a level shifter (e.g. Most serial ports on such embedded devices do not use 12 V, but either use 5 or 3.3 V where 3.3 V is becoming more and more common. It also comes without any handshaking lines, which is why there are only three pins (RX, TX, GND) neccessary for the serial port. This serial port is basically a standard RS232 serial port with the exception that it uses only 3.3 V instead of the up to 12 V of a normal serial port found on desktop computers. Three of the pins are assigned to a serial port. Opening the device revealed that there is a small connector on the PCB.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |