Vaisala DMT340 User Manual download pdf (Page 145)

Chapter 5 ___________________________________________________________________ Modbus

VAISALA _______________________________________________________________________ 143

Enabling Serial Modbus

In addition to enabling the Modbus protocol in the device, Modbus over

RS-232 or RS-485 needs the following software settings: serial bit rate,

parity, number of stop bits, and Modbus device address.

Using Display/Keypad (Optional)

1. Open the Main Menu by pressing any of the ▼▲◄► arrow

buttons.

2. Navigate to Interfaces ► Serial Interface.

3. On the Serial Interface settings screen:

- Enable the Modbus protocol.

- Change the baud rate and parity if necessary.

- Set the Modbus device address.

1101-033

Figure 75 Serial Interface Settings

4. After changing the settings, press the EXIT button. The Modbus

configuration is now complete, as configuration changes made with

the display and keypad are effective immediately.

Using Serial Line

1. Open the transmitter cover.

2. Connect power supply wiring (if not using the power supply

module) and power up the transmitter.

3. Connect the USB service cable between a computer and the service

port of the transmitter.

4. Start the Vaisala USB Instrument Finder program (which has been

installed on the computer along with the USB service cable driver),

and check the COM port that the cable is using.

5. Open a terminal program, and connect to the service port. The

fixed serial line settings of the service port are 19200, 8, 1, N.

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Vaisala DMT340 User Manual Page 145