That's pretty slow when you're used to a network connection, but let me show you how serial data is transferred so you can also understand why it's a lot slower:įigure 1. To give you an idea of how fast (or slow) a serial port is, at its best you will get around 12 to 14 KB per second.
Its pinouts are a lot simpler when compared to the parallel port, but the speed is also a lot slower. Every computer has at least two COM ports, COM1 and COM2. The Serial Direct Connection is the one which utilizes the COM ports of your computers. We cover serial data transfer, port pinouts, port speeds, serial interface types (DB9 & DB25), null modem cables and much more. This article covers the popular serial ports on workstations, servers and laptop computers.
