Vaisala HMP110 Podręcznik Użytkownika Pobierz pdf (Strona 27)

Chapter 4 ________________________________________________________________ Operation

VAISALA _______________________________________________________________________ 25

CHAPTER 4

OPERATION

This chapter contains information that is needed to operate HMP60 and

HMP110.

Getting Started

When the probe has been connected to a power supply, there is a short

start-up delay before the measurement data is available through the

selected output(s) - analog or RS-485. The delay depends on the

operating voltage that is supplied to the probe:

- Operating voltage 5 ... 14 V: one second start-up delay

- Operating voltage 14 ... 28 V: four second start-up delay

Serial Line Communication

HMP60 and HMP110 support two-wire RS-485 communication. The

RS-485 interface is non-isolated and offers a maximum communications

rate of 57600 bits/s.

There is no internal termination for the RS-485 on the probe. Use of

termination resistors is not recommended. If the resistors are used, the

possible increase in current consumption should be taken into account.

Connecting to the Serial Interface

The connection to the serial interface is via the 4-pin connector on the

probe; see connector pinout on page 20.

For temporary use of the serial interface (for example, calibration), you

can use the optional USB cable (Vaisala order code: 219690). Before you

can use the USB cable, you must install the provided USB driver on your

PC, see Installing the Driver for the USB Cable on page 26.

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Vaisala HMP110 Podręcznik Użytkownika Strona 27