FNM alpha SM 230, User Manual, Page: 10 / 72

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Description of device-specific features
Repeater module
The repeater module is for the transmission of the sensor data to the base module. It is
used in case of difficult radio propagation conditions or in case the distances between
sensor and base module are too great.
The voltage supply is realized via an external power supply unit.
A voltage supply over an internal 3.6 V battery (lithiumthionylchloride, size LR14) is
possible, but it is not recommended because of the higher power demand of the re-
peater module.
All versions of the repeater module alpha WSN RM 300 can be used. But a configuration
of the sensor module alpha WSN SM 230 to repeater operation is also possible.
Description of device-specific features
Base modules
The base modules of the sensor network are the interface to the PC network or the IP
network. They receive the data of the single sensor modules and transfer them to a PC.
Connections over RS232, USB, LAN or WLAN are available for this.
The base module can temporarily store up to approx. 45,000 sensor data sets. In case of a
temporary termination of the visualization software or switching off of the PC, the sensor
data is so buffered and is not lost. After starting the visualization software again, the
data is transmitted to the PC.
Furthermore, the base module is equipped with two potential-free outputs (change-over
contacts) that can be controlled from the PC, if required (alarm signalling).
There are two LEDs at every base module. The green LED indicates the operation of the
module (glowing when the module is active) and the red LED indicates correctly trans-
mitted and received packets of data.
Status LED (red) glowing for approx. 50 ms:
packet of data transmitted correctly
Status LED (red) glowing for approx. 500 ms: packet of data received correctly