FlexVander DX4i PRO IO list

Use this page as the terminal, wiring, jumper, and interface reference for a supported FlexVander DX4i PRO installation.

Hardware overview

Item	Value
Controller	DX4i PRO
Supply	8-36 VDC
Outputs	8 protected high-side digital outputs supplied from `SUPP`
Digital inputs	8 inputs. DIN1-DIN4 can be normal digital inputs or S0 inputs. DIN5 can be wakeup input.
Analog inputs	4 inputs, selectable 0-10 VDC or 0-20 mA
Field interfaces	RS485 port 1, shared RS485 port 2, 1-Wire, and 3.3 V DC output for supported accessories

How to use this IO list

For basic FlexVander operation, connect supply, required pump command outputs, and required pump operating feedback signals for the selected program.

Configure the active pump program with FVAPRG.
Configure local push-button behaviour with FVALOCIN.
Configure output pulse time with FVADOUTT#.
Configure stop-output behaviour with DWCONTACT# where the installation uses that option.

Required basic pump wiring

Supply voltage

Supply	Connection	Terminal	Condition
8-36 VDC	Positive	`SUPP` pin 28 or pin 29	Use both `SUPP` pins when output load requires it.
8-36 VDC	Negative	`PGND` pin 27	Use as power supply return path.

Program 1 basic wiring: two pressure pumps

Program 1 controls one or two pressure pumps without a submersible pump. Wire the command outputs and feedback inputs for each installed pressure pump.

Digital outputs

The outputs are high-side digital outputs, not potential-free relay contacts. Add interface relays when the pump panel requires dry contacts. FVADOUTT# sets pulse time. DWCONTACT# can change stop-output behaviour where the installation requires it.

Output	Function	Terminals	Condition
`DOUT1`	Start pressure pump 1	Pin 30	Required when pressure pump 1 is installed.
`DOUT2`	Start pressure pump 2	Pin 31	Use only when pressure pump 2 is installed.
`DOUT3`	Stop pressure pump 1	Pin 32	Required when pressure pump 1 is installed.
`DOUT4`	Stop pressure pump 2	Pin 33	Use only when pressure pump 2 is installed.

Operating feedback

Connect a compatible pump-running or status signal to each listed input. The signal must be active when the pump is running.

Input	Pump	Terminals	Signal	Condition
`DIN2`	Pressure pump 1	Pin 41, `SGND`	Pump-running feedback	Required when pressure pump 1 is installed.
`DIN3`	Pressure pump 2	Pin 42, `SGND`	Pump-running feedback	Use only when pressure pump 2 is installed.

Program 2 basic wiring: submersible pump and pressure pumps

Program 2 controls one submersible pump and one or two pressure pumps. Wire command outputs and feedback inputs for each installed pump.

Digital outputs

Output	Function	Terminals	Condition
`DOUT1`	Start submersible pump	Pin 30	Required when the submersible pump is installed.
`DOUT2`	Start pressure pump 1	Pin 31	Required when pressure pump 1 is installed.
`DOUT3`	Start pressure pump 2	Pin 32	Use only when pressure pump 2 is installed.
`DOUT4`	Stop all pumps	Pin 33	Required stop output for program 2.

Operating feedback

Connect a compatible pump-running or status signal to each listed input. The signal must be active when the pump is running.

Input	Pump	Terminals	Signal	Condition
`DIN1`	Submersible pump	Pin 40, `SGND`	Pump-running feedback	Required when the submersible pump is installed.
`DIN2`	Pressure pump 1	Pin 41, `SGND`	Pump-running feedback	Required when pressure pump 1 is installed.
`DIN3`	Pressure pump 2	Pin 42, `SGND`	Pump-running feedback	Use only when pressure pump 2 is installed.

Interface overview

Interface	Terminals	Use	Continue
Digital inputs	`DIN1`-`DIN8`, `SGND`	Pump feedback and local push buttons	Program 1, Program 2, Local push buttons
Digital outputs	`DOUT1`-`DOUT8`	Pump start and stop commands	Program 1, Program 2
Analog inputs	`AI1`-`AI4`, `AGND`	Pressure transmitters and analog field sensors	Pressure control, Mini Weather Station
RS485	`RS485_1+`/`RS485_1-` and `RS485_2+`/`RS485_2-`	Energy meters and supported field instruments	RS485 energy metering
1-Wire	`1Wire` pin 7, `1Wire-LED` pin 8, `SGND`	Supported temperature or ID accessories	Mini Weather Station

Optional standard features

Local push buttons

Local push buttons are active only when the FlexVander setup uses FVALOCIN.

Input	Function	Terminals	Signal	Condition
`DIN7`	Program 1 pressure pump 1 button or program 2 pressure pump 1 button	Pin 46, `SGND`	Local contact or input signal	Use only when selected by `FVALOCIN`.
`DIN8`	Program 1 pressure pump 2 button or program 2 pressure pump 2 button	Pin 47, `SGND`	Local contact or input signal	Use only when selected by `FVALOCIN`.
`DIN5`	Program 2 submersible pump button	Pin 44, `SGND`	Local contact or input signal	Use only when selected by `FVALOCIN`.

Pressure control

Use pressure control only when pressure transmitters are installed. Select voltage or current input from the transmitter nameplate and the selected input setup.

Input	Function	Terminals	Signal	Continue
`AI1`	Pressure line 1	Pin 17, `AGND`	0-10 V or 0-20 mA	`FVAPRESS`, `FVAPTRMODE`
`AI2`	Pressure line 2	Pin 18, `AGND`	0-10 V or 0-20 mA	`FVAPRESSDELAY1/2`

For transmitter wiring details, see Analog transmitter wiring.

RS485 energy metering

Use RS485 energy metering only when an energy meter is installed and assigned to FlexVander. Terminate the RS485 bus only at the two physical endpoints.

Port	Terminals	Use	Condition
RS485 port 1	`RS485_1+` pin 10, `RS485_1-` pin 11, `SGND`	Energy meter bus	Use unless the cabinet documentation assigns port 2.
RS485 port 2	`RS485_2+` pin 13, `RS485_2-` pin 14, `SGND`	Second RS485 bus	Use only when assigned. Port 2 shares resources with RS232 port 1.

See Energy meters and Serial RS485 communication for the shared bus requirements.

Mini Weather Station and DataGuard path

Use the controller interfaces below only when the FlexVander installation includes matching sensors and DataGuard reporting.

Sensor path	Interface	Terminals	Condition
Analog level or pressure sensor	Analog input	`AI1`-`AI4`, `AGND`	Use only if the input is not already assigned to pump pressure control.
Temperature or ID accessory	1-Wire	`1Wire` pin 7, `1Wire-LED` pin 8, `SGND`	Use the accessory wiring supplied with the sensor.
Weather or level instrument	RS485	`RS485_1+`, `RS485_1-`, `SGND`	Use when the instrument is a supported RS485 device on the installation.

See Climate and level sensors for supported serial instruments.

Accessory DC output

Output	Terminals	Use	Condition
3.3 V DC output	`DC-OUT` pin 3 and `SGND` pin 5 on connector X1	Supported low-voltage accessories	This is not a 24 V transmitter supply.

Hardware jumper reference

The Viking defaults are the delivered FlexVander setup. Change a jumper only when the connected signal or instrument requires a different input type.

Jumper	Function	Viking default	Other setting	Change when
`JP8`-`JP11`	Input mode for `DIN1`-`DIN4`	Position 1-2 for standard FlexVander contact/S0-style wiring	Position 2-3 for normal positive digital input	The connected feedback or push-button signal requires normal input mode.
`JP1`, `JP14`, `JP16`, `JP17`	Analog input mode	Current input when pressure transmitter is delivered	Voltage input	The connected transmitter is 0-10 V.
`JP7`, `JP12`	RS485 termination	Not installed unless delivered as an RS485 endpoint	Installed	The controller is one of the two physical endpoints on the RS485 bus.