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(Units with basic control – not supplied with free cooling versions) The control panel enable data exchange
with a supervision system via RS485 serial connection. The optional connection cable must be ordered to be
attached to the SERIAL socket on the I/O board.
FITTING THE OPTIONAL RS485 BOARD
pin 1:
GND
pin 2:
RX+ / TX+
pin 3:
RX- / TX-
1 2 3
4
3
2
1
ON OFF
Insert in serial connector
1. Disconnect the power supply to the board;
2. Insert the RS485 card on the SERIAL connector of the main board;
3. When making the connection of the serial line, pay attention to polarities as shown;
4. The serial line must be closed by means of a 120 Ω - 1/4W resistance, placed between the TX/RX+ and
TX/RX- terminals of the board at the endline of the network.
5. The address of the board is set using the dip switches, adding the HA parameter value (default = 1):
Net. Addr.
Par. HA
0+1
1
16+1
1
32+1
1
48+1
1
64+1
1
RS485 SERIAL
CIRCUIT
Dip Switch
Dip 1
Dip 2
Dip 3
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
ON
OFF
Dip 4
Net. Addr.
OFF
80+1
ON
96+1
OFF
112+1
ON
128+1
OFF
26
Par. HA
Dip 1
Dip 2
1
OFF
ON
1
OFF
ON
1
OFF
ON
1
ON
OFF
Dip 3
Dip 4
OFF
ON
ON
OFF
ON
ON
OFF
OFF
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