Dump view displays all sent and received data transmitted through a serial line.Modbus view displays received and sent Modbus data (RTU and ASCII).Terminal view presents the received data in a text console of ASCII characters.Table view presents the recorded IRPs in table format.Line view displays detailed information about the requests that are sent on a specific serial line.The “New monitoring session” window will be displayed. You can also use the keyboard shortcut “CTRL+N” or click “New” on the main toolbar.ģ. Choose “Session > New session” from the main menu. Once the settings are in order you can begin a new testing session by following these steps.Ģ. Possible values for this parameter are Hardware (P), Xon/Xoff (X) and None. cHandflow: Defines the flow control value.nStopBits: Defines the number of stop bits.cParity: Parity can be defined with one of these values: (E)ven, (O)dd, (M)ark, (S)pace, or (N)one.nDataLength: Defines a packet’s data length.A default value of 110 is used if no other value is provided. nBaudRate: Defines the serial port baud rate.In the descriptions below, “n” indicates a numeric item and “c” designates a character item. Serial port control information is presented as a string of 4 or 5 items, separated by a dash. Using the COM Port Status window in Serial Port Tester you can query the status of lines going to and from the computer. Consult documentation regarding making measurements through a serial port for detailed information regarding each setting. This may slow down messages slightly but will cause no further harm. If you don’t know the number of stop bits, you should set it to 2. The information you need to provide includes the number of serial ports to which your device is connected, its parity, the number of data bits per byte, and the baud rate. You will be entering this data into the serial port tester software prior to its use. ► Loopback Testing Using The HyperTerminal UtilityĬollect all the information that you can regarding the serial device you will be connecting to your machine.Check the COM port due to loopback test.When you are having difficulty obtaining data when using COM Port Tester (former Serial Port Monitor), try these steps: It provides RS232 tester software that allows you to gain insight into your serial communication to identify and fix com port errors. The question is "how to test a serial port?"ĭownload the Com Port Monitor application. You decide you might need to do some serial port testing. This is not acceptable and you think the issue is related to the RS232 communication. Data acquisition software has been installed but the expected data does not appear. In most circumstances, this path is not required because the use of software flow control is common with most modern serial devices.You have just connected a serial device to your machine’s COM port. 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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