ROTRONIC MP400H - Manual (Page 6)

E-M-HM-V1_10
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroMet MP Humidity Temperature
Meteorological Probe: User Guide Instruction Manual
Document Type
Page 6 of 19
Document title
© 2009; Rotronic AG E-M-HM-V1_10
3.4 Output signals
HygroMet MP: 3-wire version
With the ROTRONIC HW4 software any of the two analog output signals can be made to correspond to one of
the following:
• Relative humidity
• Temperature
• Calculated parameter
Any output can also be disabled.
The scale of each analog output can be set within the numerical limits of -999.99 and 9999.99. The D/A
converters used to generate the analog output signals feature a 16-bit resolution.
HygroMet MP 3-wire version: this version offers a RS-485 digital interface in addition to the two analog
output signals. Making use of this interface allows the simultaneous transmission of relative humidity,
temperature and calculated parameter.
3.5 Analog output signal type
The HygroMet MP 3-wire version can be ordered with the following output signal types:
a) Current outputs: 0…20 mA or 4…20 mA
b) Voltage outputs: 0…1 V, 0…5 V or 0…10 V
Note: the analog signal type is configured at the factory and cannot be changed by the user.
3.6 Service connector
The HygroMet MP has an internal service connector (mini-USB type). This connector provides access to the
HygroMet MP UART digital interface (Universal Asynchronous Receiver Transmitter) and is used to connect
the HygroMet MP with a service cable to a PC running the ROTRONIC HW4 software. See “Maintenance” for
the location of the service connector and for the type of service cable to be used. The service connector is
used to configure the HygroMet MP and to and update its firmware as necessary.
3.7 Probe
The HygroMet MP is normally used with the HC2-S3 probe and is compatible with all available models of
HygroClip 2 probes. For detailed information on the HygroClip 2 probes see document E-M-HC2 Probes-V1.
4 User configurable settings and functions
The HygroMet MP ships configured as specified on the customer order. The HygroMet MP can be installed
and used just as any conventional humidity and temperature probe and most users will never need to use the
HygroMet MP configurable settings and functions. Use of the RS-485 digital interface may require
configuration by the user of the RS-485 network address.
Making use of the HygroMet MP and HC2-S3 probe configurable settings and functions is entirely up to the
user and the appropriate settings depend on the user application. We have provided below a short description
of the HygroMet MP and HC2-S3 and probe functions and also indicated the factory default settings.