S&P CADB-HE BASIC Series, Manual

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10. BUILDING MANAGEMENT SYSTEM (BMS) CONNECTION
Jumper Functionality
JP1 Enable Modbus communication (Control of the unit from the BMS)
JP4 In Modbus networks, defi ne the last unit of the network (End of line)
The controller has a Modbus communication module through which it is possible to control the unit from
an external BMS, as well as monitor a large part of the functional variables of the unit.
By default, the communication is disabled, to enable it, the position of the JP1 jumper existing on the
controller board must be modifi ed.
Control from remote hand
terminal
CLOSED OPEN OPEN
Jumper JP1: MODBUS communication
MODBUS control (BMS) MODBUS control (BMS)
Once the MODBUS network wiring has been completed, the last unit of the network (end of line) must
be specifi ed using the JP4 jumper on the controller board.
The unit is the end of line
CLOSED OPEN
Jumper JP4: End of line resistance (in Modbus networks)
MODBUS control (BMS)
The unit is not the end
of line
OPEN
Position of the JP1 and JP4 Jumpers depending on the location of the unit in the Modbus network.
-3 $ELHUWR
% $
&21752/%$6,&Qž &21752/%$6,&Qž &21752/%$6,&Qž
&$%/($3$17$//$'2 &$%/($3$17$//$'2
-3 $ELHUWR -3 &HUUDGR
-3 $ELHUWR -3 $ELHUWR
-3 $ELHUWR
9 9
86(5 86(5 86(5
%06
02'%86
56
$ 9 % 9 $ 9 % 9
9*QG
$
%
Open Open Open
SHIELDED CABLE SHIELDED CABLE
Open Open