cp2102 usb rs232 adapter

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Place of Origin:
Guangdong, China (Mainland)
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Plug In
Product Description
  • USB2.0, USB1.1 compatible
  • USB RS232 PC COM port converter
  • Support PC COM port standard signal: RX, TX, CTS, RTS, GND
  • Support EEPROM
  • Support Win XP, 2000, Win 7, Linux, etc
  • Self-powered, no extra power needed
  • Support LED indicator for Tx, RX
  • Support 9600 ~ 256000bps baud rate
  • ABS transparent, ABS black housing available
  • CE., RoHS compliance 

About CP2102

     The CP2102 is a highly-integrated USB-to-UART Bridge controller providing a simple solution for updating RS-232 designs to USB using a minimum of components and PCB space. The CP2102 includes a USB2.0 full speed function controller, USB transceiver, oscillator, EEPROM, and asynchronous serial data bus(UART) with full modem control signals in a compact 5 x 5mm QFN-28 package. No other external USB components are required. The on-chip EEPROM may be used to customized the USB Vendor ID, product ID, product description string, power descriptor, device release number and device serial number as desired for OEM applications. The EEPROM is programmed on-board via the USB, allowering the programming step to be easily integrated into the product manufacturing and testing process.

     Royalty-free Virtual COM Port(VCP) device drivers provided by Silicon Laboratories allow a CP2102-based product to appear as a COM port to PC applications. The CP2102 UART interface implements all RS-232 signals, including control and handshaking signals, so existing system firmware does not need to be modified. In many existing RS-232 designs, all that is required to update the design from RS232 to USB to replace the RS232 level-translator with the CP2102. Direct access driver support is available through the Silicom Laboratories USBXpress ddriver set.


RS232 specifications, introduction
Communication as defined in the RS232 standard is an asynchronous serial communication method. The word serial means, that the information is sent one bit at a time. Asynchronous tells us that the information is not sent in predefined time slots. Data transfer can start at any given time and it is the task of the receiver to detect when a message starts and ends. Asynchronous communication has some advantages and disadvantages which are both discussed in the next paragraph.
RS232 bit streams
The RS232 standard describes a communication method where information is sent bit by bit on a physical channel. The information must be broken up in data words. The length of a data word is variable. On PC's a length between 5 and 8 bits can be selected. This length is the netto information length of each word. For proper transfer additional bits are added for synchronisation and error checking purposes. It is important, that the transmitter and receiver use the same number of bits. Otherwise, the data word may be misinterpreted, or not recognized at all.

With synchronous communication, a clock or trigger signal must be present which indicates the beginning of each transfer. The absence of a clock signal makes an asynchronous communication channel cheaper to operate. Less lines are necessary in the cable. A disadvantage is, that the receiver can start at the wrong moment receiving the information. Resynchronization is then needed which costs time. All data received in the resynchronization period is lost. Another disadvantage is that extra bits are needed in the data stream to indicate the start and end of useful information. These extra bits take up bandwidth.

Data bits are sent with a predefined frequency, the baud rate. Both the transmitter and receiver must be programmed to use the same bit frequency. After the first bit is received, the receiver calculates at which moments the other data bits will be received. It will check the line voltage levels at those moments.

With RS232, the line voltage level can have two states. The on state is also known as mark, the off state as space. No other line states are possible. When the line is idle, it is kept in the mark state.

Start bit

RS232 defines an asynchronous type of communication. This means, that sending of a data word can start on each moment. If starting at each moment is possible, this can pose some problems for the receiver to know which is the first bit to receive. To overcome this problem, each data word is started with an attention bit. This attention bit, also known as the start bit, is always identified by the space line level. Because the line is in mark state when idle, the start bit is easily recognized by the receiver.

Data bits

Directly following the start bit, the data bits are sent. A bit value 1 causes the line to go in mark state, the bit value 0 is represented by a space. The least significant bit is always the first bit sent.

Parity bit

For error detecting purposes, it is possible to add an extra bit to the data word automatically. The transmitter calculates the value of the bit depending on the information sent. The receiver performs the same calculation and checks if the actual parity bit value corresponds to the calculated value. This is further discussed in another paragraph.

Stop bits

Suppose that the receiver has missed the start bit because of noise on the transmission line. It started on the first following data bit with a space value. This causes garbled date to reach the receiver. A mechanism must be present to resynchronize the communication. To do this, framing is introduced. Framing means, that all the data bits and parity bit are contained in a frame of start and stop bits. The period of time lying between the start and stop bits is a constant defined by the baud rate and number of data and parity bits. The start bit has always space value, the stop bit always mark value. If the receiver detects a value other than mark when the stop bit should be present on the line, it knows that there is a synchronization failure. This causes a framing error condition in the receiving UART. The device then tries to resynchronize on new incomming bits.

For resynchronizing, the receiver scans the incomming data for valid start and stop bit pairs. This works, as long as there is enough variation in the bit patterns of the data words. If data value zero is sent repeatedly, resynchronization is not possible for example.

The stop bit identifying the end of a data frame can have different lengths. Actually, it is not a real bit but a minimum period of time the line must be idle (mark state) at the end of each word. On PC's this period can have three lengths: the time equal to 1, 1.5 or 2 bits. 1.5 bits is only used with data words of 5 bits length and 2 only for longer words. A stop bit length of 1 bit is possible for all data word sizes.

RS232 physical properties

The RS232 standard describes a communication method capable of communicating in different environments. This has had its impact on the maximum allowable voltages etc. on the pins. In the original definition, the technical possibilities of that time were taken into account. The maximum baud rate defined for example is 20 kbps. With current devices like the 16550A UART, maximum speeds of 1.5 Mbps are allowed.


The signal level of the RS232 pins can have two states. A high bit, or mark state is identified by a negative voltage and a low bit or space state uses a positive value. This might be a bit confusing, because in normal circumstances, high logical values are defined by high voltages also. The voltage limits are shown below.

RS232 voltage values Level    Transmitter
capable (V)    Receiver
capable (V)
Space state (0)    +5 ... +15    +3 ... +25
Mark state (1)    -5 ... -15    -3 ... -25
Undefined    -    -3 ... +3

More information about the voltage levels of RS232 and other serial interfaces can be found in the interface comparison table.

The maximum voltage swing the computer can generate on its port can have influence on the maximum cable length and communication speed that is allowed. Also, if the voltage difference is small, data distortion will occur sooner. For example, my Toshiba laptop mark's voltage is -9.3 V, compared to -11.5 V on my desktop computer. The laptop has difficulties to communicate with Mitsubishi PLC's in industrial environments with high noise levels where the desktop computer has no data errors at all using the same cable. Thus, even far beyond the minimum voltage levels, 2 volts extra can make a huge difference in communication quality.

Despite the high voltages present, it is not possible to destroy the serial port by short circuiting. Only applying external voltages with high currents may eventually burn out the driver chips. Still then, the UART won't be damaged in most cases.

Maximum cable lengths

Cable length is one of the most discussed items in RS232 world. The standard has a clear answer, the maximum cable length is 50 feet, or the cable length equal to a capacitance of 2500 pF. The latter rule is often forgotten. This means that using a cable with low capacitance allows you to span longer distances without going beyond the limitations of the standard. If for example UTP CAT-5 cable is used with a typical capacitance of 17 pF/ft, the maximum allowed cable length is 147 feet.

The cable length mentioned in the standard allows maximum communication speed to occur. If speed is reduced by a factor 2 or 4, the maximum length increases dramatically. Texas Instruments has done some practical experiments years ago at different baud rates to test the maximum allowed cable lengths. Keep in mind, that the RS232 standard was originally developed for 20 kbps. By halving the maximum communication speed, the allowed cable length increases a factor ten!

RS232 cable length according to Texas Instruments Baud rate    Maximum cable length (ft)
19200    50
9600    500
4800    1000
2400    3000

Error detection

One way of detecting errors is already discussed. It is the frame detection mechanism which is used to test if the incomming bits were properly surrounded by a start and stop bit pair. For further error checking, a parity bit can be used. The use of this bit is however not mandatory. If the existence of wrong bits is rare (when communicating with an internal modem for example) or if a higher level protocol is used for error detection and correction (Z-modem, RAS, etc) communication speed can be increased by not using the parity feature present on the UART.

Parity is a simple way to encode a data word to have a mechanism to detect an error in the information. The method used with serial communications adds one bit to each data word. The value of this bit depends on the value of the data word. It is necessary that both the transmitter and receiver use the same algorithm to calculate the value of the parity bit. Otherwise, the receiver may detect errors which are not present.

Even parity

Basically, the parity bit can be calculated in two ways. When even parity is used, the number of information bits sent will always contain an even number of logical 1's. If the number of high data bits is odd, a high value parity bit is added, otherwise a low bit will be used.

Odd parity

The odd parity system is quite similar to the even parity system, but in this situation, the number of high bits will always be odd.

Disadvantages of the parity system

The parity system using one bit for each data word is not capable of finding all errors. Only errors which cause an odd number of bits to flip will be detected. The second problem is, that there is no way to know which bit is false. If necessary, a higher level protocol is necessary to inform the sender that this information must be resent. Therefore, on noisy lines, often other detection systems are used to assure that the sent information is received correctly. These systems mostly do not operate on single data words, but on groups of words.


        Sinforcon is a specialized manufacturer in cable assemblies with 3000square meters manufcturing sites and 300 works in Shenzhen, China.

        Main products are USB converter cables: usb to RS232, USB UART TTL 3.3v level and USB UART TTL 5v level. USB RS485 to RJ11, RJ45 cables, USB RS422 cables, USB Parallel cables, USB to Audio cable.  The chips are availavble for PL2303, CP2102, FT232RL, ZT213. SP485, MAX3232, CM119, etc. These products are widely used in POS terminal applications, serial mouse, modem, router cotrolling, data acquisition and industrial automation applications.

       The products and service are widely accepted by the customers from more than 60 countries and regions. Most products are certificed by CE, RoHS, CCC

       Siforcon means Sincere for connecting. We will be keeping Sincere for customers and contnuous developing on connecting cables and hope to establish business relationship with the customers all over the world on the base of mutual equality and benefit



Company Information

Shenzhen Sinforcon Electronics Ltd, established in 2002, is a private enterprise in usb serial cables manufacturing fields. The main business are ranging of usb rs232, usb ttl, usb rs485 cables manufacture and customized services.  It has a 3000 square meters and 120 workers manufacture sites in Dongguan, China. The manufacturing capacity is 300000 ~ 500000 per month.  And it was certificated by TUV, CE, ROHS, REACH, etc.


Packaging & Shipping

Deliver Time:

3-5 days for small ordering on stock materials

15-25 days for non-stock materials products



Standard: PE bag/ESD bag each, then in carton

Customized packing method welcome

Carton size: 46/30*30cm,  200/250pcs in one carton

Weight: 48-80g/pcs,   8-15kg/carton

Inside packing sample

Outside packing



  1. By air express, by air freight, by sea optional
  2. 3-5 days by DHL/FEDEX/UPS/TNT air express
  3. 15-30 days by sea




Q: Can I buy the cable online?

A:  Yes, please buy it on aliexpress.com/store/401907, it support credit card payment.

Q: Does this cable need to install driver?

A: Yes, it need to install the USB serial drivers for different OS

Q: Where should I get the drivers?

A:  From sinforcon.com/download or the chips supplier website or email us

FTDI drivers download link:
Driver installing guide:
FT232RL chip datasheet:

Q:  How to install the USB RS232 drivers?

A:  There is a driver installing guide on chip manufacture websites or email us.

Q:  Does the cable support Win 7/8/10

A:  Yes, all Sinforcon cables are supplrt Window 7/8/8.1/10

Q:  What is the chip can support Android, Mac?

A:  FT232RL FT231XS FT230XS PL2303HXD CP2102 support Mac, Android,WIN8/10

     PL2303TA support Win8/10,not support Android, Mac

Q:  Does the cable support invert RXD/TXD signals?

A:  FT232RL chip cable support FT_prog.

Q:  How to get fastest reply from Sinforcon?

A:  By alibaba Trade manager, ID1: connectingcables  or skype: richard90072000

Q:  Does the cable with CE, RoHS, REACH certificate

A:  Yes. if you need it, email us please