If you are trying to control something in the real world using your computer, the serial port is perhaps the easiest means of communication. I shall walk you through the process of setting up a serial port and hyperterminal on a computer running windows XP.
In order to set it up, first you have to find it on your computer. Long long ago, almost all computers had two serial ports, called "COM1" and "COM2", one a with a nine pin and the other with a 25 pin connector.Now times have changed and the serial port has vanished.Don't give up hope, however. The USB to serial converter has arrived, and it can be used instead. It is usually a dongle which plugs into a USB port, with a nine pin male connecter at the other end.On my desktop computer, the motherboard has two built in serial ports. The third seial port, here labelled COM4, belongs to the USB to serial adapter I have plugged in.So, to find the serial port on your computer, scout around its back. If you find a nine pin male connector (two rows, five and four, pins sticking out inside a metal shell) it has a serial port built in.Or get a USB to serial converter and plug it in.Open up Device Manager. Right click on "My Computer" and select properties (at the bottom of the list that pops up). Click on the "Hardware" tab. Click on the "Device Manager" button and a something similiar to this picture should appear.Click on the '+' sign on the left of the "Ports (COM & LPT) to expand it. The list of printer and Serial ports available will be shown. Make a note of those, you will need them in the steps that follow.
You can select the serial port to use for connecting. You set up a serial connection by specifying a name (anything goes) an icon (select one) and then you come to this screen which lets you specify the exact serial port to use.You can also get to this screen by clicking on the little hand-on-document icon below the title bar.Select the serial port you intend to use. If you are unsure, try each in turn until you stumble on the right one.
To connect to the serial port, a minimum of three lines are needed - the transmitted data TxD(pin3), the received data RxD(pin2), and Ground(pin5). Data comes out from the computer as positive and negative excursions of the voltage on the TxD pin with respect to the System Ground pin. This voltage would be somewhere in the fifteen to twelve volt range.Data goes into the computer as positive and negative excursions of the RxD pin. At least three volts would be required for the computer to get the data without error.
When hyperterminal has been correctly setup, whatever you type into its window gets sent out to the wild yonder through the TxD pin. Whatever gets in through the RxD pin gets displayed on the screen.By default, if you open up hyperterminal and start typing, nothing gets shown on screen. This is normal.However, if you connect the RxD and TxD pins together, they wiggle together and so whatever you type gets printed to the screen as well. This is the loopback test.You can make a loopback plug by taking a nine pin female connector (socket) and soldering a wire between pins 2 and 3. This is then inserted into the connector of the serial port to be tested.Or, alternatively, you can take a bit of wire and wrap it around pins 2 and 3 of the relevant serial port as shown in the figure.
With the loopback plug in place, click inside the hyperterminal window and press a few random keys on the keyboard.Whatever you type should get shown there. If so, congratulations.If not, you have gone wrong somewhere, so go back and select a different port or something and in effect press every button until you get it working.A word of warning, though.Hyperterminal has an option to "echo" characters, which means it will show the characters typed on the keyboard as well as the characters coming in through the RxD pin. Check that this is not the case, before concluding that you have been successful. It is simple, really. Removing the loopback connection will stop the echo via the serial connection.
If you enable local echo and connect the loopback plug, you will get the effect shown here: each character you type will be printed twice.This is useful when you have your robot, or whatever, to send back status reports in response to commands received via the serial port. Ordinarily you will get to see only the robot's half of the conversation, so by enabling local echo you can get to see the commands sent to it too.
Also you can easily create virtual COM ports using software solution, like Virtual Serial Port Driver ( -com-port/). You won't see the difference between real and virtual serial ports, because virtual serial ports are absolutely the same copies of real ones.
Excellent article! I will share with my team. Shorting the send/receive pins is a great way to test that your USB Serial Controller is working correctly and has the correct drivers without having a serial port to connect it to.
That is the correct pinout if you are looking directly at the female and it is correct if you are looking at the back of the male, where the cable connect. If you are looking at the front of the male or the rear of the female it will confuse you.
Can somebody please help me, the other day i bought myself a MAX233CPP chip and a serial connector from maplin, I soldered up a 4 conductor cable to the Rx pin (pin2), the Tx pin (pin 3) and ground (pin 5) but when I try sending data to it to view on my oscilloscope, nothing works. I tried DOS and Hyperterminal but they don't work. Can somebody please help me get it to work.
Actually the usb port is usually easier to work, it sets itself up. Except when it doesn't. Also worth mentioning is that some usb devices set themselves up as virtual serial ports ( and if you do not have a serial port this is how usb to rs232 converters work). Very useful, you might want to extend it to include the usb virtual rs232.
Qbix, please read this topic, again. I'm doesn't talk that IPX connected through or with virtual COM port. I talk about serial connection. I try connect the game with NULL-MODEM mode, and the game hungs like in last cases. I'm talk about -->IT.
Hello, all again. Sorry that i don't answer, all this time. So, before i give some data from serial parametrs, i must to say that and in case when i try to connect with the MODEM emulator, and in case when i try to connect with the IPX, and i try to connect with the SERIAL, when, how I think, must be showen some Lan Lobby of Warcraft, to choose some map, error hapened. And this Error, hapened in all of this cases, and always equally. I'm talk about CR2 descriptor, that showing with develop info of dos/4gw every time when this error hapened.
One of the networking options in Starcraft was direct cable connection over a serial port. The Starcraft UI and user manual both claim that this supports up to 4 players, but things get dicey for 3-4 players:
When each computer had a public IP address, it was relatively easy for Starcraft instances to connect over the Internet. Battle.net served as a matchmaking service, essentially allowing users to advertise their public IP addresses. Once the game started, clients would send each other UDP packets directly in a peer-to-peer topology.2
The use of proxies to connect computers to battle.net is officially unsupported by Blizzard.However we realize that as the number of households with multiple networked computers grows,proxies are becoming a popular inexpensive method of allowing multiple computers to gain accessto the Internet. We will try to pass along as much information as possible to assist users inthe setup of their proxies to allow play over battle.net. Most all of the proxy setupinformation we currently have was sent in by users like yourself.
An issue that is often faced in virtual environments is the problem of gaining access to the serial devices attached to the host machine. Some virtualization software enables this to be done with some simple configuration changes, but many do not. In order to use the serial devices in a VM, you often need to employ third-party communication tools. In these cases, the utility is used to create virtual VirtualBox COM ports that enable your session to interact with local serial devices such as printers or scanners.
VirtualBox Serial Port machines also offer support for virtual serial ports in a virtual machine. When the virtual serial port becomes enabled, the guest OS is presented with a UART device that is standard compatible. Here, both the reception and transmission of data is possible. The connection between the host and the virtual serial port can be configured. However, the exact details are dependent on the host OS.
You can use the VBoxManage command or the Settings tab to command the establishment of virtual serial ports. In one of the methods, you can configure a maximum of 4 virtual serial ports for each virtual machine.
Raw File: The virtual serial port output can be sent to a file. This is helpful for collecting diagnostic output. Any file can be used. The only requirement is that VirtualBox users has enough privileges to write and create.
TCP Socket: This helps forward serial traffic over TCP/IP. It can act as a TCP client that connects to servers or a server itself. The option allows for the direct connection between the remote machine and the guest's serial port via TCP.
Ensure your USB cable is properly connected directly to your computer's USB port. Also check that the status light is illuminated. Open your computer's audio menu and verify that Blue Microphones Yeti is the selected sound source
It could be hardware issues, software issues, physical connections and more. These troubleshooting steps cover most of the most common audio issues, and even if you're not a tech enthusiast, they'll work in most cases. If not, you can contact Jabra support, and choose the Jabra service you need, depending on your device. 2b1af7f3a8