After the data has been transmitted, a stop bit is sent. ![]() Likewise, using 5 bits limits the highest possible value to 31. Notice that when only 7 data bits are employed, you cannot send ASCII values greater than 127. Almost all devices transmit data using either 7 or 8 databits. Both receiver and the transmitter must agree on the number of data bits, as well as the baud rate. There may either be 5, 6, 7, or 8 data bits, depending on the number you have selected. Once the start bit has been sent, the transmitter sends the actual data bits. Some types of serial devices support only one-way communications and therefore use only two wires in the cable - the transmit line and the signal ground. In order to be able to do this, it uses separate lines for transmitting and receiving data. The serial port on your PC is a full-duplex device meaning that it can send and receive data at the same time. ![]()
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