IN-E-HyFlex-V4_10
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
Instruction Manual
Document Type
HygroFlex transmitter version 4: instruction
manual
Document title
Page 11 of 61
© 2006; Rotronic AG IN-E-HyFlex-V2_10.doc
When used with HW3, the HygroFlex automatically sets its serial interface as follows:
Parity : even
Data bits : 7
Stop bits : 1
Note: the HygroFlex will automatically set its serial interface to the above settings when
interrogated by a third-party software that uses the same ASCII commands as HW3 to request
data. On models with the optional Ethernet interface, the internal module must be re-configured as
indicated in document IN-E-TCPIP-Conf_10.doc (also available in PDF format).
IMPORTANT: The HygroFlex can be configured by the user with a Baud rate of 57600. The factory
default Baud rate of 19200 is compatible with both HW3 and HW4. The Baud rate of 57600 is
compatible only with HW4.
RS-232 interface
This interface is used to read measurement data, adjust any HygroClip probe connected to the
HygroFlex and to configure the HygroFlex. The RS-232 allows direct connection of the HygroFlex
to the COM port of a PC (up to 150 m / 490 ft separation)
The HW4 software (version 1.2.2 or higher) should be installed on the PC.
RS-485 interface
This interface is used to connect together a number of HygroFlex transmitters (as well as other
ROTRONIC devices) so as to form a RS-485 multi-drop. This is useful when the number of PC
ports is limited and provides savings on cabling costs. The RS-485 interface has the same
functionality as the RS-232 interface (measurement data, adjustment of HygroClip probes and
device configuration).
In a RS-485 multi-drop, the master is automatically the device that is connected to a COM port,
USB port or network port (Ethernet) of the PC. Any ROTRONIC device that is equipped with both a
RS-232, USB or Ethernet interface and a RS-485 interface can be used as the master. The other
devices in the RS-485 multi-drop are slaves. Any HygroFlex 2 or HygroFlex 3 transmitter can be
used either as a slave or a master, without special configuration other than giving a unique RS-485
address to each device and setting each device to use the same Baud rate.
2.6 Optional Ethernet (TCP/IP) interface (HygroFlex 2 and 3)
As an option, both the HygroFlex 2 and HygroFlex 3 can be ordered with the combination of an
Ethernet (TCP/IP) interface and a RS-485 serial interface. The HW4 software accepts connection
to the PC by means of an Ethernet network.
Note: when equipped with this option, the HygroFlex 3 does not have a Test connector.
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