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Chapter 4 _________________________________________________________________ Operation

VAISALA ________________________________________________________________________ 29

CHAPTER 4

OPERATION

This chapter contains information that is needed to operate the HMP60

and HMP110 series probes.

Getting Started

NOTE

Before you connect a

n HMP60 or HMP110 series probe to a device, it is

recommended to power off the device.

When the probe is connected to a power supply, there is a delay as the

probe starts up and the analog output stabilizes. The delay depends on the

output type, and on the operating voltage that is supplied to the probe:

- Probes with analog output:

- 4 s at operating voltage 13.5 ... 16.5 VDC

- 2 s at other valid operating voltages

- Probes with digital output: 1 s

Serial Line Communication

NOTE

In analog probes,

serial line communication is intended for service use

only.

HMP60 and HMP110 series probes 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.

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