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2.4.2.3 Installation of additional serial board
The serial board needs to be installed in the “BMS card” slot in the controller board where a comb connector is
provided. Below is a description of the procedure to be followed for serial board installation in the BMS1 slot.
With the help of a flat head screwdriver
remove the cover on the controller marked
as “BMS card”.
When installing the serial board, snap it
onto the two plastic supports that are
integral with the pCO controller box.
After inserting the board, the cover must be
put back in place making the exposed
board connector match the pre-cut hole in
the cover.
For additional information on how to install the serial boards, refer to the controller
manufacturer's manuals.
2.5 pLAN local network
The pLAN local network allows the various components making up the system to communicate with each
other.
The number of elements making up the system varies according to its complexity: the “basic” one consists
solely of an I/O board and a terminal for management of units with one or two compressors, while the most
“complex” one has several units, each with its own terminal, which communicate with each other, and a
terminal for the entire system.
Each element can be identified in the network by its serial address, which is attributed through a software
procedure.
The connections between the pLAN network and the various boards are implemented using a two-core,
shielded and braided cable, having a min. cross-section of 0.5 sq.mm. Refer to the wiring diagram of the unit
for the connections and the type of cable.
The connection must be made as follows: the terminals “RxTx+” and “RxTx-“ of the devices to be networked
must be placed in parallel, and the cable shielding must be connected to the corresponding “GND” terminals.
If the distance between the terminal and the pCO board that powers it is less than 50 m, the terminal can be
powered directly through a 6-way telephone cable.