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HP User Manual
firmware 3.1 Rev.04 IT 38/ 51
5 BMS USER VARIABLES
The unit can be connected the several supervision system, in particular the following BMS protocols can be used:
Carel and Modbus.
The connection is made by a BMS serial port.
The connetion protocol is managed by the following optional board:

Modbus RS485 : cod. PCOS004850 (see Fig. 8.a)
On the following figure you can see the connection diagram between BMS and uPC.
120ohm
MASTER
G
ND
R
X/
TX
+
R
X/
TX
-
Fig. 8.a
Note :
Suggested cable for data line with 100-120ohm impedance type BELDEN 3105A EIA Industrial RS-485 PLTC/CM
The following table shows the variables shared with supervisor.
Nota : On the first column shows the Carel address, the second one the ModBus address (packet), in case of
“register” communication mode, the address of the ModBus column must be increased of 1, both for digital variable
(coil) and for analog variable (register).
Nota
:
(*) “nome” indica il nome della variabile utilizzato internamente per il programma di commissionino