STXC2 User’s guide
Version 2.0
7 of 30
1.5 Communication module STIO (option).
Connection of the communication module STIO via the serial communication line it enables the
operation and monitoring by the BMS. The function switch on the ventilation unit is in position
AUTO when using the communication module.
By activating the analogue and digital inputs of the STIO the control will more or less be taken from
the MMI STCU.
The analogue inputs are connected to 2-10VDC signals and the digital outputs are activated by
24Vac or 12VDC supply. Some of the analogue inputs have predefined functions as set points and
running conditions.
Every single input has it’s own enable input, that activates the specific function. Functions that not
are selected on the STIO will automatically be controlled by the MMI STCU.
The analogue and digital outputs makes external monitoring possible.
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