Chapter 1: Introduction
HOBO Energy Logger Pro User’s Guide 3
Logger components
FlexSmart module ports – Up to three FlexSmart modules can be installed on the logger. These can consist of any
combination of Analog and TRMS modules. Third-party sensors (available through Onset) are connected to the
logger through the terminals on these modules.
Trigger button – Hold down the button for at least two seconds to manually start the logger in the field if the
Trigger start option was selected in HOBOware Pro during launch.
Indicator LEDs – There are three green and three red status indicators. The green indicators blink to show status or
activity. The red indicators blink to show that battery or memory are low, or that a sensor error has occurred. For
more detailed description of the indicators, refer to “Diagnostics and troubleshooting” on page 19.
Stereo jack for serial cable –The serial interface cable is connected to this port to communicate with HOBOware
Pro or the HOBO U-Shuttle.
RS-232 jack – This port allows you to connect the logger via a DB9 connector instead of the stereo jack. The pinout
for the logger's RS-232 connector is as follows:
Pin # Function
1 DCD (Connected internally to 4)
2 RxD (Logger Received Data In)
3 TxD (Logger Transmit Out)
4 DTR (Connected internally to 1)
5 Signal Ground
6 NC
7 RTS (Connected internally to 8)
8 CTS (Connected intermally to 7)
9 NC
Shell Logger Chassis Ground
RJ-12 jacks – Any combination of up to six Smart Sensors can be installed on the logger.
External power jack – An optional external power adapter can be connected to this port to power the logger.
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