ROTRONIC HygroLog HL20 - Manual (Page 6)

IN-E-HL20-V1_12
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroLog HL20 and HL21 data logger:
User Guide Instruction Manual
Document Type
Page 6 of 17
Document title
© 2010-2011; Rotronic AG IN-E-HL20-V1_12
2.8 Service and data connector
The service / data connector (mini-USB type) can be accessed after removing the back cover
(see Operation). The connector gives access to the data logger UART digital interface (Universal
Asynchronous Receiver Transmitter).
Configuring the data logger or retrieving the recorded data requires cable AC3006 or equivalent.
One end of the cable plugs into the service / data connector. The other end plugs into the USB of
a PC with the ROTRONIC HW4 software installed.
See “Initial start-up” for the location of the
service / data connector.
2.9 Optional display
The optional LC display has a backlight which can be enabled or disabled when configuring the
data logger.
o HL20D: depending on the configuration of the logger, the LC display shows relative humidity
and temperature or the dew / frost point and temperature. The top line displays humidity
(%RH or the dew / frost point)
o HL21D: the LC display shows temperature.
The LC display can be configured to show the measured or calculated values with either one or
two decimals.
Note: the LC display is automatically turned on when the data logger is connected to the USB
port of a PC by means of cable AC3006 or equivalent.
2.10 Operating limits
Models without display:
● -10…60°C with the factory supplied alkaline batteries
● 0…100 %RH, non condensing
Models with display:
● 0…50°C with the factory supplied alkaline batteries
● 0…100 %RH, non condensing
2.11 Configurable settings
Configuration of the data logger by the user and access to its functions requires a PC with the
ROTRONIC HW4 software (version 2.4.0 or higher) installed. Service cable AC3006 is used to
connect the service / data connector to a USB port of the PC.