User Manual

E-M-HF4-V1_22

Rotronic AG

Bassersdorf, Switzerland

Document code

Unit

HygroFlex HF4 Humidity Temperature

Transmitters: User Guide

Instruction Manual

Document Type

Page

20 of 29

Document title

7.3 HF45 (digital output)

Configuration and full access to all HF45 functions requires a PC with the ROTRONIC HW4 software installed.

Starting with firmware version 1.3, the HF45 offers several communication protocol options that allow users to

read the measurement data without the HW4 software. When using the standard RO-ASCII protocol, access

to some of the HF45 functions is also possible without HW4. For details, see document E-M-AC3000-CP.

IMPORTANT: Depending on the type of digital interface, either the PC or the HF45 must be configured

by the user as indicated below.

a) USB network connection

Prior to connecting the HF45 to a USB port you must install the ROTRONIC USB driver on the HW4 PC. For

instructions see the HW4 manual E-M-HW4v3-Main (§ 7.3)

b) Ethernet (TCP/IP) network connection (wired or wireless)

Prior to connecting the HF45 to an active Ethernet network you must configure the HF45 TCP/IP settings. For

instructions see the HW4 manual E-M-HW4v3-Main (§ 7.4) and technical note E-M-TCPIP-Conf

WARNING: Connecting a device to an active Ethernet network can disrupt communications on the network.

Before connecting the HF4, make sure that it is properly configured for your network

c) RS-485 serial interface (multi-drop)

Instructions for using the HF45 with a RS-485 network are provided in the following manuals:

E-M-HW4v3-Main (§ 7.5), E-M-HW4v3-F2-003 and E-DV04-RS485.01.

Notes:

o Instruments connected to the same RS-485 network must use the same baud rate and each instrument

must be given a unique RS-485 address

o RS-485 Compatibility: The communications protocol used by the HF45 and other AirChip 3000 products

is not compatible with the protocol used by the previous generation of ROTRONIC products. Do not

connect legacy products and AirChip 3000 products to the same RS-485 multi-drop network.

The specifications of the RS-485 interface are as follows:

Baud rate : 19200

Parity : none

Data bits : 8

Stop bits : 1