![]() ![]() ![]() It is important to match the baud rate on the terminal with what we have programmed into the Arduino. The baud rate defines how quickly data is transmitted between devices. Then, select the appropriate port for my Arduino, and ensure that the baud rate is 9600. ![]() With the Arduino prepared and plugged into our computer, open CoolTerm and select OPTIONS. Next, download CoolTerm from Roger Meier’s website. I have uploaded a simple sketch from Arduino Project Hub to the Arduino to use the sensor as a rangefinder, and to return the distance detected. Today’s example will involve an Arduino Uno board with a HC-SR94 Ultrasonic Sensor. In this section, I will show you how we can use CoolTerm to easily monitor some sensor data in real time. How to use CoolTerm to Monitor Arduino DataĪrduino is a popular microcontroller platform that utilises serial port communication. In this case, we have to make use of a serial terminal like CoolTerm to perform tests on data transmitting and receiving. This will help us to ensure that everything is working as expected. Compared to parallel communication (4, 8 or 64-bit), serial communication is popular in embedded systems due to low cost and effective long-distance transmission.įor makers and engineers, we sometimes need to monitor the data that is transmitted between our devices and computer. Serial communication continues to be used all around us today. If you are unfamiliar with serial communication and want to know more, please visit our detailed beginner’s guide – RS232 vs TTL: Beginner Guide to Serial Communication. In contrast, parallel communication sends several bits as a whole, through a few parallel channels. What makes serial communication distinct is that data is sent sequentially one bit at a time through a single channel. What is Serial Communication?Īs you might have guessed, serial communication is used to send and receive data to peripheral devices. This makes CoolTerm a popular and affordable option for users who need a convenient and effective serial terminal software solution. In most circumstances, this path is not required because the use of software flow control is common with most modern serial devices.CoolTerm is a user-friendly terminal for serial communication with hardware that has been connected to your computer via serial ports.ĬoolTerm is freeware/donationware developed by Roger Meier, and is available for Windows / Mac / Linux devices. Likewise, your connected device will use pin 8 (CTS - Clear To Send) to tell the computer when information can be sent.īy connecting pins 7 and 8, we are sending the RTS signal to the CTS pin allowing us to verify that the com port is able to handle hardware flow control. In a normal RS-232 connection with hardware flow control checked, the computer will use pin 7 (RTS – Request To Send) to tell the connected device when information can be received. This path handles the flow of information between the computer and device, similar to path 1. In most applications, you will only need to connect pins 2 and 3 to test the functionality of a DB-9 serial port. By connecting pin 2 (Rx- Receive Data) to pin 3 (Tx- Transmit data), we are able to verify that the computer is able to send and receive information through a serial connection. This path handles the actual information being transmitted across the serial connection. This handshake, for the most part, just verifies that the modem, or other DTR / DSR enabled device, is turned on and active.īy connecting pins 1, 4, and 6, we are taking the DTR signal and sending it to the DSR pin and the CD pin allowing us to verify that the computer is able to communicate with a modem.Īdditionally, you can connect pin 9 (RI - Ring Indicator) to this path to verify that the computer is able to detect when a call is coming in from the modem. The computer will then use pin 4 (DTR - Data Terminal Ready) and pin 6 (DSR – Data Set Ready) to create a handshake between the computer and modem. The modem will use pin 1 (CD – Carrier Detect) to tell the computer that there is a carrier tone detected or it has made a connection with a second modem. It is important to understand the purpose of each connection for troubleshooting serial connections. The above tables and wiring diagram outlines the required connections to create a loop back plug.
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