38
HED-HCAT SE FREE COOLING
ENGLISH
Plan NETWORK SET-UP
A
I
ADDRESSING AND MANAGEMENT OF CONNECTIONS BETWEEN BOARDS (pLAN)
A
I
Rx-
Tx- Tx+ GND
33
34
35
Rx+
Rx-
Tx- Tx+ GND
33
34
35
Rx+
The representation to the side shows the necessary connection
for setting up the pLAN network between the 2 units.
The pLAN network distinguishes a physical connection between
pCO2 boards.The boards must be addressed for the network to
operate correctly.
If the same address is assigned to two elements in the network,
pLAN will not work!
How to assign the addresses
Set the pLAN addresses with binary logic by changing the posi-
tion of a bank of dip switches located on the pCO2 (top left);
THE BOARDS MUST NOT BE POWERED. The addresses to be
set on the two pLAN machines are given below.
MASTER means the main control unit, while the SLAVE is the
service unit that activates in support of the master.
The address of the unit is indicated in the bottom right corner of
the pCO2 main mask.
Example of use of plan networks
A pLAN network connection makes it possible to carry out the
following functions
• balancing of the hours of operation between the shelter
units by rotation of the stand-by units.
• switching on of the stand-by units if other units are off due
to serious alarm or black-out.
• switching on of the stand-by units to compensate excessive
heat load.
UNIT 1
Master board
Address 1
Slave board
Umpteenth address
UNIT 2
