Vaisala HMDW110 - Using Service Port With Terminal Application; Device Information and Status Commands

6.3 Accessing Service Port Command Interface in
Devices With Modbus Output
Follow the steps below to connect to the serial line with a transmitter with Modbus output. You
can also use the procedure to retrieve the communication settings of your device, if you do not
know them. You must use the Vaisala USB cable (Vaisala order code: 219690) for the
connection.
• Computer with
• Windows operating system
• Terminal application
• Free USB port
• Driver for Vaisala USB cable installed
• Vaisala USB cable for computer connection (219690)
1. Connect the USB cable to the PC and install the driver, if necessary. Do not connect the
cable to the transmitter yet.
2. Open the terminal program and open a connection to the corresponding COM port using
the default settings 19200, 8, N, 1, no flow control.
3. Keep the Enter key pressed down and connect the other end of the USB cable to the
transmitter. This will cause the transmitter to start in serial mode, using the default serial
settings.
You can now use the transmitter with the terminal program.
To prevent Modbus mode from being restored on the next power-up, select a dierent serial
mode with the smode command.
More Information
‣
Serial Commands (page 33)
‣
Serial Line Communication (page 43)
6.4
Serial Commands
The notation <cr> refers to the carriage return control character, which you can send in a
terminal application by pressing enter on your keyboard. Before entering commands, send a
<cr> to clear the command buer.
You can enter the commands in uppercase or lowercase. In the command examples, the
keyboard input by the user is in bold type.
Chapter 6 – Using Service Port With Terminal Application
33