Western Sahara Yemen Zambia Zimbabwe. Learning Center. Please note our new company name. Let us help you solve all of your communications problems. Download White Paper. Newsletter Signup phone: email: info advantech-bb. Cellular Routers. AirborneM2M WiFi Wzzard Wireless Sensing Platform. Wireless Accessories. Industrial PCs. Standmount Embedded Automation Controllers. Fiber NIC Cards. Unmanaged Media Converters. Managed Media Converters.
FTTX Products. Mode Converters. Modular Chassis Series. Power Over Ethernet Products. Telco Products. Management Software. SFP Transceivers. Ethernet Serial Device Servers. Modbus Gateways and Protocol Converters. Ethernet Switches. Ethernet Routers. Ethernet Extenders. SmartSwarm Modbus Gateway. The "COM" stands for "Communications". Its pinouts are a lot simpler when compared to the parallel port, but the speed is also a lot slower.
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. 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:. The above picture gives you an idea on how serial data is transferred.
Each colored block that is numbered is sent from PC 1 to PC 2. 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.
This is a pretty good representation of data flow in a serial cable. Serial ports transmit data sequentially over one pair of wires the rest of the wires are used to control the transfer. Another 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. The simplest way to connect two computers together is to use a null modem RS cable.
For a simple solution, a three-wire RS scheme is sufficient, where one wire is the signal ground, the second is the receiver, and the third is the transmitter.
But depending on the type of software, some kind of handshake may be required. Below are the most popular types of null modem cables for RS This simple pinout of the cable does not allow monitoring of data transmission and reception at the «hardware level», but at the software level, monitoring is possible using XOFF analysis and XON symbols. Not all programs are able to work with such a cable. This is more a theoretical concept. There are also cables with a handshaking simulation on a «stub» and partial handshaking without the ability to control the data transmission at the «hardware level».
The following is the RS cable wiring with full handshaking recommended by Microsoft. At one point, the RS 9-pin Serial Port used to be a common connector on the back of every computer. But with USB being a much better protocol and easier to use, the serial port has just about disappeared from modern desktop computers.
If you want to know more about how I discovered this and the differences, then continue reading. Recent Post. Universal Wall Speaker Mounts. Chainmail Tie. Osmotic Diuretics Mechanism Of Action. Makita Drill Set. Evil Burger. Sailboat Sun Shade. Keto Vegetarian Recipes.
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