Chapter 4 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 23
Serial Communication
Connecting to Serial Interface
The MMT162 can be connected to a PC using the RS-485 line,
for example using the USB serial connection cable (Vaisala item
219690). The cable also provides operation power to the transmitter from
the USB port. It is OK to connect the USB serial connection cable even if
the transmitter is already supplied with operation power from another
cable.
To connect to serial interface:
1.
If you have not used the MMT162 USB serial connection cable
before, install the driver that came with the cable. Refer to section
Installing the Driver for the USB Cable on page 24 for detailed
instructions.
2.
Connect the USB serial connection cable between your PC and the
RS-485 port of the MMT162 (port II).
3.
Open the terminal program (e.g. PuTTY in Microsoft Windows
®
).
4.
Set the serial settings of the terminal program, and open the
connection. See the following table.
Table 4
Default Serial Interface Settings
Property
Description / Value
Baud rate
19200
Parity none
Data bits
8
Stop bits
1
NOTE
In case the transmitter starts up in an error state, the serial interface
settings are automatically returned to the default settings given in
Table 4 above.
