Vaisala HUMICAP MMT162 Guía de usuario descargar pdf (Pagina 24)

User's Guide _______________________________________________________________________

22 ___________________________________________________________________ M210934EN-D

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 23 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 (for example, 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

Stop bits

If the MMT162 is in Modbus mode, to access the serial port command

interface, follow the procedure in Accessing Serial Port Command

Interface from Modbus Mode on page 44.

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Vaisala HUMICAP MMT162 Guía de usuario Pagina 24