Vaisala HUMICAP HMP41 Guia do Utilizador descarregar pdf (Página 29)

Chapter 4 ________________________________________________________________ Operation

VAISALA _______________________________________________________________________ 27

CHAPTER 4

OPERATION

This chapter contains information that is needed to operate the HMT130.

Using the Service Port

HMT130 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 analog output or the RS-485 serial line.

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 HMT130 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 cable into use, you must install the provided USB

driver on your PC. When installing the driver, you must acknowledge

any security prompts that may appear. The driver is compatible with

Windows 2000, Windows XP, Windows Server 2003, and Windows

Vista.

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

you have already connected it.

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Vaisala HUMICAP HMP41 Guia do Utilizador Página 29