Xylem IM255 AQUAVAR Intelligent Pump Controller - Manual (Page 43)

details on installing shielded/screened cables. The parameter list in the table below
shows parameters used to configure communication for two common protocols, Modbus
RTU and BACnet. The parameter list in the second table below shows parameters that
determine the control source for certain drive functions. Use these parameters to
determine whether digital inputs or the BMS/PLC has control of the function.
Figure 27: Connections for external control source connected through comm. port
Table 10: Parameter settings for Modbus RTU and BACnet protocols
Parameter Number Parameter Description Protocol
Modbus RTU BACnet
8-02 Control Source FC Port FC Port
8-30 Protocol Modbus RTU BACnet
8-31 Address 1 1
8-32 Baud Rate 19200 9600
8-33 Parity/Stop bit Even Parity, 1 Stop bit No Parity, 1 Stop bit
8-34 Estimated cycle time 0 ms 0 ms
8-35 Minimum Response Delay 10 ms 10 ms
8-36 Maximum Response Delay 5000 ms 5000 ms
8-37 Maximum Inter-Char Delay 0.86 ms 25 ms
Table 11: Parameters determining control source for controller functions
Parameter number Description Set to
8-01 Control Site Determines the location of the control source.
Set to Digital and ctrl.word to use both serial
bus and digital input control. Set to Digital
only to use only the digital inputs. Set to
Controlword only to use only the serial bus.
8-50 Coasting Select Determines the control location of the coasting
(stop) function. Set to Digital input to use a
digital input only. Set to Bus to use only the
serial bus only. Set to Logic AND to use the
serial bus AND a digital input. Set to Logic OR
to use the serial bus OR a digital input.
Electrical Installation
Aquavar ® Intelligent Pump Controller INSTRUCTION MANUAL 41