Older computers would have one DB-9 male connector and one DB-25 male connector. Most new computers have two COM ports with 9 pins each these are DB-9 male connectors.
#Panolapse 1.25 serial serial#
Serial ports transmit data sequentially over one pair of wires (the rest of the wires are used to control the transfer).Īnother way you can think of it is like a one lane road where the road is wide enough to only fit one car at a time (one data block at a time in our example above) so you would imagine that the road cannot process several cars at one time. This is a pretty good representation of data flow in a serial cable. PC 2 will receive the data in the same order it was sent, in other words it will receive data block 1 first and then 2, all the way to block 7. Each colored block that is numbered is sent from PC 1 to PC 2. The above picture gives you an idea on how serial data is transferred. 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.
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