ROTRONIC HygroMet MP402H - Manual (Page 14)

E-M-HM-V1_12
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroMet MP Humidity Temperature
Meteorological Probe: User Guide Instruction Manual
Document Type
Page 14 of 20
Document title
© 2009-2011; Rotronic AG E-M-HM-V1_12
Measuring humidity or temperature only
Operation of the HygroMet MP does not require both current loops to be closed. When using the HygroMet
MP to measure either humidity only or temperature only, close only the loop that is being used.
Using the ROTRONIC HW4 software, any unused output of the HygroMet MP can be disabled.
6.3.3 Grounding (all models)
Operation of the HygroMet MP does not require that the unit be electrically grounded. However, we
strongly recommend connecting to an earth ground the (-) side of the supply voltage to the probe.
7 Operation
7.1 Analog outputs
Use the HW4 software to configure the HygroMet MP as desired, complete the mechanical and electrical
installation, make the electrical connections probe and simply power up the HygroMet MP.
7.2 RS-485 serial interface
Instructions for using the HygroMet MP with a RS-485 network are provided in the following manuals:
E-M-HW4v3-Main (§ 7.5), E-M-HW4v3-F2-014 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 HygroMet MP but not to
its probe)
o RS-485 Compatibility: The communications protocol used by the HygroMet MP is the RO-ASCII
protocol. This protocol is not compatible with the protocol used by the previous generation of ROTRONIC
products. Do not connect legacy products and the HygroMet MP 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
8 Maintenance
8.1 Service cable
Cable AC3006 is used to connect the HygroMet MP to a USB port of a PC running the ROTRONIC HW4
software. The AC3006 cable does not power the HygroMet MP and the HygroMet MP should be powered
separately.
Prior to using this cable you must install the ROTRONIC USB driver on the PC (available from the HW4 CD or
from www.rotronic-humidity.com). For instructions see the HW4 manual E-M-HW4v3-Main (§ 7.3)