KSB CalioTherm Pro 25 Installation & Operating Manual page 32

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5 Installation at Site
Vin
a1
0 V
R
a2
0 V
1
a3
2
D-
a4
D+
0 V
L
a5
H
0 V
Fig. 15: Terminal wiring diagram for the Modbus data line
a Data line connections
a1 External 0-10 V
a2 Remote ON/OFF
a3 Terminating resistor for Modbus cable (DIP switches)
a4 Modbus or KSB ServiceTool
a5 Dual-pump configuration
The terminating resistor is enabled when the corresponding pump-integrated DIP
switch in the terminal wiring compartment next to the Modbus terminal pair is
enabled. See illustration.
Table 11: Key to the terminal codes
Terminal code
D-
D+
0 V
Table 12: Settings of Modbus terminating resistors
Position of DIP switches 1 and 2
ON
OFF
NOTE
The two DIP switches 1 and 2 must both be set to the same status.
Fig. 16: Illustration of terminals
CalioTherm Pro
Description
RS485
A-
B+
COM
Status
Modbus terminating resistor enabled
Modbus terminating resistor disabled
Modbus
D0
D1
COM