Vaisala HMT120 Manual do Utilizador descarregar pdf (Página 25)

Chapter 4 _______________________________________________________________ Service Port

VAISALA ________________________________________________________________________ 23

CHAPTER 4

SERVICE PORT

This chapter describes the service port of the HMT120.

Using the Service Port

HMT120 motherboard has an 8-pin RJ-45 connector for service use.

Service port uses RS-232 signaling levels. Vaisala offers an optional

USB cable (Vaisala order code 219685) for connecting the transmitter to

your PC.

NOTE

The service port is intended for short

-term use such as calibration. For

permanent installation, use the ana

log output.

Connecting a PC to the service port may cause erroneous analog output

because of a possible ground loop. Use the service port for service only

and disconnect the PC after the service operation.

The cable can also provide operation power to the transmitter, so the

wires at the screw terminals need not to be connected in order to operate

the transmitter.

If you have not used the HMT120 USB cable before, install the driver

that came with the cable. Refer to section Installing the Driver for the

USB Cable below for detailed instructions.

Installing the Driver for the USB Cable

Before taking the USB service cable into use, you must install the

provided USB driver on your PC.

1. Check that the USB service cable is not connected. Disconnect the

cable if you have already connected it.

2. Insert the media that came with the cable, or download the latest

driver from www.vaisala.com.

3. Execute the USB driver installation program (setup.exe), and

accept the installation defaults. The installation of the driver may

take several minutes.

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