Enabling serial modbus, Using display/keypad (optional), Using serial line – Vaisala MMT330 User Manual
Page 129: Figure 62, Serial interface settings, Enabling serial modbus on pa
Chapter 5 ___________________________________________________________________ Modbus
VAISALA _______________________________________________________________________ 129
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 62
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.