ROTRONIC HF8 - Manual (Page 20)

E-M-HF8-V2_10
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroFlex HF8 Humidity Temperature
Transmitter: User Guide Instruction Manual
Document Type
Page 20 of 35
Document title
© 2012; Rotronic AG E-M-HF8-V2_10
7 Operation
7.1 Analog outputs
Use the ROTRONIC HW4 software to configure the HF8 as desired, complete the mechanical and electrical
installation, connect the probe and simply power up the HF8.
7.2 Digital interface
The HF8 uses the RO-ASCII communications protocol and does not offer any other option.
The different types of digital interface available with the HF8 are best used with a PC with the HW4 software
installed (version 2.4.0 or higher). In principle, using an application other than HW4 is limited to reading
measurement data from the HF8 and communication is limited to the RDD (data request) and REN (RS-485
address change) commands. These commands described separately in document E-M-AC3000-CP.
IMPORTANT: Depending on the type of digital interface, either the PC or the HF8 must be configured
by the user as indicated below.
7.2.1 Ethernet (TCP/IP) interface
Prior to connecting the HF8 to an active Ethernet network you must configure the TCP/IP settings of the HF8
using either the HW4 software (version 2.4.0 or higher) or the TCP/IP configuration tool available from
www.rotronic-humidity.com. For instructions see the HW4 manual E-M-HW4v3-Main (§ 7.4) and technical
note IN-E-TCPIP-Conf
WARNING: Connecting a device to an active Ethernet network can disrupt communications on the network.
Before connecting the HF8, make sure that it is properly configured for your network
7.2.2 RS-485 serial interface (multi-drop)
Instructions for using the HF8 with a RS-485 network are provided in the following manuals:
E-M-HW4v3-Main (§ 7.5), E-M-HW4v3-F2-015 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 (the address requirement applies to the HF8 but not to its
probes)
o RS-485 Compatibility: The HF8 uses the RO-ASCII communications protocol. This protocol is not
compatible with the protocol used by both the previous generation of ROTRONIC products and by the
HygroLog HL-NT data logger. Do not connect legacy products or the HL-NT data logger to the same RS-
485 network as HF8.
The specifications of the RS-485 interface are as follows:
Baud rate : 19200
Parity : none
Data bits : 8
Stop bits : 1