Make Mobile Phone Data Cable Method

The price of the original mobile phone data cable is expensive, which makes many users prohibitive. Through the analysis and research of the data cable and its schematic diagram of Siemens, Samsung, Alcatel, Lenovo and other models, it is found that the principle of the data cable of most models on the market is much the same, but the interface shape and definition are different. Many models of Metal Braided Usb Cable can be completely homemade, as long as according to the actual model of the definition of data line interface to make appropriate changes. Taking Siemens 6688, 6618, 3618 and other mobile phones as an example, detailed introduction to the production of Metal Braided Usb Cable for your reference.
Let's first look at the definition of computer RS232C port:
① Carrier detection (DCD)
② Data acceptance (RXD)
③ Outgoing data (TXD)
④ Data terminal ready (DTR)
⑤ Signal ground wire (SG)
⑥ Data Ready (DSR)
⑦ Request Send (RTS)
⑧ Clear send (CTS)
⑨ Ringing indicator (RI)
Its signal is EIA level (-- 3 - -15V, +3 - +15V). The interface definition of Siemens 6688 and other mobile phones:
Ground wire, used for the negative electrode of the charger and the data line
② left track of earphone
③ Positive terminal of the charger
④ Empty, do not short circuit with other feet
⑤ Data OUT
⑥ Data IN
A surname
⑧ Feet have the same function. Switch (one of them is connected to the ground short, the other is connected to the switch on the headset)
⑨, commonly used in MIC
⑩MIC positive pole
2 earphone right sound channel
(12) Na-ear place. Its signal is CMOS/TTL(0-3.3V) level. Because the computer serial port and mobile phone data port (TTL circuit) have different electrical characteristics, in order to make them communicate with each other, the signal must be converted.