what is RS232 Communication??

        RS232 is Based on serial communication which means it can send or receive one bit at a time RS232 is a Standard (1987) to make a communication sophisticated RS232 connect a peripheral devices like printer,scanner,modem and mouse with computer RS232 can provide p2p communication some time called point to point-communication the speed of RS232 is not too much fast we can achieve a maximum speed of 920 Kbps during a data communication by using RS232.

           we can connect a peripheral device with computer at a maximum distance of 50 ft RS232 styles is different it,s shape is just like D so people called it a D style so it comes in two shape the one is D9 ( total 9 pins connector ) and second one is D25 ( total 25 pins connector ) but mostly three pins are using such as Tx,RX,CT

1) TXD ( Pin NO 3 ) : The function of this pin is to send or transmit data serially to a connected devices with computer

2) RXD ( Pin NO 2 ) : The function of this pin is to Receive a data serially from connected devices with computer

3) CTS&RTS ( Pin NO 7,8 ) : Clear to send and Ready to send Just to check that the channel is busy or free for the communication

4) DSR ( Pin NO 6 ) : it,s stand for Data set ready it works with device like modem to tell to computer that now i m ready to take a new data

5) DTR ( Pin NO 4 ) : The function of 

this pin is to connect or disconnect a peripheral device from computer

6) DCD: ( Pin NO 1 ) : To check that Devices is disconnected or still connected with the pc

7) RI: ( Pin NO 9 ) : it,s stand for Ring indicator the function of this pin is to inform the computer that modem is ringing 

8) SG: ( Pin NO 5 ) : it,s stand for Signal ground in a simple words a reference point of the circuitry 

How to set up your own Electronics Lab at home

Every Electronic hobbyists have a dream of setting up his own lab at home to learn, explore, widen the knowledge and of course have fun with Electronics. But most of us don't how to start setting up one and even if we did it will end up in a complete mess. So after going through several forums and asking the suggestions of pros i have prepared this article on setting up your own lab, i hope this will be helpful for all budding Electronic Engineers and Hobbyist.

WORKSPACE:

This is the first thing you need to set for your homemade lab. The workspace should consist a large wooden work bench, desk or table that fits the components and tools while you are working. Ensure that work area is well lit and comfortable to work even for long time. Your work area should be accessible to household electrical power (220V AC)

Also install a Desktop or Laptop computer in your work area which will be helpful to refer datasheets of components or IC's. Also it will come handy when you are working with Microcontrollers and makes your work a lot easier.

POWER SUPPLIES:

This comes next in the list as Power supplies hold the next priority in your Electronics Lab. When coming to power supplies you have lot of options to consider but it all depends on how much you are about to invest. Bench power supply is usually preferred but it was insanely expensive and you have to spend 40% of your budget in it.

As i said you do have options, so its best to buy some DC power supply adapters which suits your need such as 12v, 5v or 9v. You can also construct power supply for your needs, it takes bit of work but believe me it will come handy.

IMPORTANT THINGS TO BUY:

• Needle Nose Pliers
• Wire Strippers
• Tweezers
• Screwdrivers
• Knife
• Drill
• Connecting Wires
• Breadboard
• Gator Clips
• Helping Hands
• Solder Iron/Gun
• Solder
• Flux
• Multimeter
• Protoboards

These are the things which are very essential and should be in your lab if you wanna be a better worker. And many would have noticed i missed "Oscilloscope" in the above list. A decent Oscilloscope will cost around $50 and am not sure that how many of you would like to spend that much for your lab. Usage of Oscilloscope might suit certain applications but always remember Oscilloscope is not the first thing to buy.

COMPONENTS TO BUY:

When coming to the components there is not much help others can do as you need to identify your needs. The usage of components varies based on the things you are working in your lab. Here are some of the basic components you must have in your lab.

• Resistors ( 100,330,470,1k,10k,100k,1M)
• Capacitors ( 0.1uF, 22pF, 100uF, 1000uF)
• NPN & NPN Transistors (2N222,2N3906)
• Diodes (1N4001,1N4148)
• Voltage Regulators (7805,7812)
• IC's ( 555,4017)
• LED (red, Blue, white)
• Male and Female Header
• Battery
• Push Buttons

The above list is to provide a general idea about the components to buy for your lab. Also do not forget to analyze your needs and buy the components which fit your need.

IF YOU ARE WORKING WITH MICROCONTROLLERS:

You need to spend some extra bucks if you are the one who loves to play with the Microcontrollers. A Development board is the best choice for all the programmers who wants to learn and have fun with the Controllers. There are number of Development boards in the market for 8051, PIC ,AVR or ARM Controllers.

• Arduino
• Raspberry Pi
• Easy PIC
• 
  

FINAL WORDS:

I Hope the above lists and suggestions would have given you a clear idea about setting up your lab. Setting up a perfect lab at the beginning itself is quite a difficult task, so don't get disheartened keep on expanding your lab by experimenting and adding many stuffs to it. Undoubtedly you will learn a hell lot of things and   gradually it will make you a pro.

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regards,

 Murugan