FlexVander LX4 pro IO list

Use this page as the pump-wiring, terminal, interface, and jumper reference for FlexVander LX4 pro. The LX4 pro controller provides the physical inputs, outputs, and communication interfaces used by the FlexVander pump program and optional installed functions.

Hardware overview

Controller type	Mounting	Supply voltage	Ingress protection
LX4 pro controller	9 Module M36 DIN-rail encapsulation	8-36 VDC	IP20

The physical size is W 157 x H 86 x D 58 mm without SMA connector and screw terminals.

How to use this IO list

Select the FlexVander pump program used on the installation.
Wire the controller supply first.
Wire the digital output supply before using any pump-control outputs.
Wire the pump-control outputs and operating-status feedback for each installed pump.
Add only the optional FlexVander features that are part of the delivered solution.
Use the interface overview and terminal reference for the relevant LX4 hardware section.
Check the hardware jumper reference before commissioning.

Required basic pump wiring

For basic FlexVander operation, connect the LX4 controller supply, digital output supply, pump-control outputs, and operating-status feedback for each installed pump. Select the wiring table that matches the FlexVander program used on the installation.

Controller supply and output supply

Supply	Terminals	Use	Note
Controller supply	28/29 SUPP, 27 PGND	8-36 VDC supply to the LX4 controller.	The two `SUPP` terminals are tied together internally.
Digital output supply	30 DOUT SUPP, 39 DOUT GND	External DC supply for the digital outputs.	`DOUT SUPP` is not internally connected to `SUPP`.

The LX4 digital outputs are protected high-side DC outputs. They are not potential-free relay contacts. Use an interface relay when the pump control circuit needs a potential-free contact set.

Program 1 basic wiring: one or two pressure pumps

Program 1 controls one or two pressure pumps without a submersible pump. Required for basic operation: start/stop outputs and operating-status feedback for each installed pressure pump.

Digital outputs

The digital outputs send the FlexVander start and stop signals. FVADOUTT# sets the start-output pulse/hold time. The output is not a potential-free relay contact; install an interface relay when the pump panel requires a relay contact.

Output	Function	LX4 terminal	Condition
Output 1	Start pressure pump 1	31 DOUT1	Required
Output 2	Start pressure pump 2	32 DOUT2	If pressure pump 2 is installed
Output 3	Stop pressure pump 1	33 DOUT3	Required
Output 4	Stop pressure pump 2	34 DOUT4	If pressure pump 2 is installed

Stop output behaviour can be changed with DWCONTACT# when the installation requires NC behaviour. On LX4, this changes the FlexVander output behaviour; it does not turn the high-side output into a potential-free NC contact.

Required operating-status feedback

FlexVander expects a feedback signal from each pump that has been started. If feedback is not detected after start, FlexVander stops the pump because it would otherwise run unmonitored. During operation, the same feedback input is used to detect that the pump has stopped.

Connect each pump-running feedback signal to the listed LX4 input with SGND as reference. In the default setup, use a PNP/normal positive input signal. Set the relevant DIN jumper to Position S only when the installed signal is S0/NPN/contact style.

Input	Pump	LX4 terminals	Signal	Condition
Input 2	Pressure pump 1	42 DIN2, 40 or 49 SGND	PNP / normal positive input; DIN2 Position N.	Required
Input 3	Pressure pump 2	43 DIN3, 40 or 49 SGND	PNP / normal positive input; DIN3 Position N.	If pressure pump 2 is installed

Program 2 basic wiring: submersible pump and one or two pressure pumps

Program 2 controls one submersible pump and one or two pressure pumps. Required for basic operation: start/stop outputs and operating-status feedback for each installed pump.

Digital outputs

Output	Function	LX4 terminal	Condition
Output 1	Start submersible pump	31 DOUT1	Required
Output 2	Start pressure pump 1	32 DOUT2	Required
Output 3	Start pressure pump 2	33 DOUT3	If pressure pump 2 is installed
Output 4	Stop all pumps	34 DOUT4	Required

Required operating-status feedback

Input	Pump	LX4 terminals	Signal	Condition
Input 1	Submersible pump	41 DIN1, 40 or 49 SGND	PNP / normal positive input; DIN1 Position N.	Required
Input 2	Pressure pump 1	42 DIN2, 40 or 49 SGND	PNP / normal positive input; DIN2 Position N.	Required
Input 3	Pressure pump 2	43 DIN3, 40 or 49 SGND	PNP / normal positive input; DIN3 Position N.	If pressure pump 2 is installed

Stop-circuit note: when a stop circuit must not depend directly on the LX4 high-side output, use a normally-open FlexVander output to drive an interposing relay and use the relay's NC contact in the stop circuit.

Optional standard features

Local push buttons

Local push buttons are optional physical inputs for local pump operation at the installation. Use FVALOCIN to select the digital input used for the local push button.

FVALOCIN 0 disables local push-button operation. Values 1 to 8 select LX4 digital inputs 1 to 8.

Use only an input that is available on the installed LX4 pro and not already used for pump feedback or another installed function.

For DIN1 to DIN4, the default setting is Position N for PNP/normal positive input. Use Position S only when the local button signal is wired as S0/NPN/contact style.

`FVALOCIN` value	LX4 input	Terminals	Signal / jumper	Note
1	Digital input 1	41 DIN1, 40 or 49 SGND	PNP / normal positive input; Position N default.	Do not use if input 1 is used for Program 2 submersible pump feedback.
2	Digital input 2	42 DIN2, 40 or 49 SGND	PNP / normal positive input; Position N default.	Do not use if input 2 is used for pressure pump 1 feedback.
3	Digital input 3	43 DIN3, 40 or 49 SGND	PNP / normal positive input; Position N default.	Do not use if input 3 is used for pressure pump 2 feedback.
4	Digital input 4	44 DIN4, 40 or 49 SGND	PNP / normal positive input; Position N default.	Use only when input 4 is not assigned to another function.
5	Digital input 5	45 DIN5, 40 or 49 SGND	Normal positive input; no S0 jumper.	Use only when input 5 is not assigned to another function.
6	Digital input 6	46 DIN6, 40 or 49 SGND	Normal positive input; no S0 jumper.	Use only when input 6 is not assigned to another function.
7	Digital input 7	47 DIN7, 40 or 49 SGND	Normal positive input; no S0 jumper.	Use only when input 7 is not assigned to another function.
8	Digital input 8	48 DIN8, 40 or 49 SGND	Normal positive input; no S0 jumper.	Use only when input 8 is not assigned to another function.

Pressure control

FlexVander LX4 pro can be installed with or without pressure control. If pressure control is used, connect the pressure transmitter to the relevant analog input and configure Pressure Control Settings.

AIN1 is used for pressure line 1, and AIN2 is used for pressure line 2 when separate pressure transmitters are part of the solution. LX4 analog inputs are voltage inputs by default; install the relevant analog-input jumper when the transmitter signal is a current signal.

Input	Pressure line	Terminals	Signal
Analog input 1	Pressure line 1	22 AIN1, 26 AGND	0-10 VDC or 0-20 mA, depending on jumper setting.
Analog input 2	Pressure line 2	23 AIN2, 26 AGND	0-10 VDC or 0-20 mA, depending on jumper setting.

Before commissioning, verify the transmitter nameplate/datasheet and the selected input setup. Use AIN2 only when separate pressure line 2 measurement is part of the solution.

RS485 energy metering

Use RS485 for energy meters when energy metering is part of the installation. Use Emiko-branded meters first where possible. See Energy Meters in Device Model for supported energy meters.

Node	Meter for	Condition
`100`	Submersible pump	Use only when a submersible pump is installed.
`101`	Pressure pump 1	Use only when pressure pump 1 has its own meter.
`102`	Pressure pump 2	Use only when pressure pump 2 has its own meter.

RS485 terminals and termination

Port	Terminals	Note
RS485 port 1	9 RSA 1, 10 RSB 1, 8 SGND	Use shielded cable and terminate the bus at both physical endpoints.
RS485 port 2	12 RSA 2, 13 RSB 2, 11 SGND	Use only when the delivered solution assigns the energy meter bus to port 2.

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	Installer note
Analog level or pressure sensor	Analog input	`AIN1`-`AIN4` and `AGND`	Use only if the input is not already assigned to pump pressure control.
Temperature or ID accessory	1-Wire	`1Wire`, `1Wire-LED`, `SGND`	Use the accessory wiring supplied with the sensor.
Weather or level instrument	RS485	`RSA1`/`RSB1` or `RSA2`/`RSB2` with `SGND`	Use when the instrument is a supported RS485 device on the FlexVander installation.

See Climate and level sensors for supported serial instruments.

Interface overview

Interface	Terminals	Use	Continue
Controller supply	27 PGND, 28 SUPP, 29 SUPP	8-36 VDC supply to the controller.	Controller supply.
Digital outputs	30 DOUT SUPP, 31-38 DOUT1-DOUT8, 39 DOUT GND	Required pump start and stop outputs, plus other installed output functions.	Program 1, Program 2, and Digital outputs.
Digital inputs	40 SGND, 41-48 DIN1-DIN8, 49 SGND	Required pump operating-status feedback and optional local push buttons.	Digital inputs and Local push buttons.
Analog inputs	22-25 AIN1-AIN4, 26 AGND	Pressure transmitter input when pressure control is installed.	Pressure control and Analog inputs.
RS485	9 RSA 1, 10 RSB 1, 8 SGND; 12 RSA 2, 13 RSB 2, 11 SGND	RS485 devices such as energy meters and selected field devices.	RS485 energy metering and Communication interfaces.
1-Wire	5 SGND, 6 1-Wire, 7 1-Wire LED	Optional accessories such as ID-Button or temperature sensor.	Communication interfaces.
M-Bus	18 M-BUS+, 19 M-BUS-/SGND	Wired M-Bus interface when required by the delivered solution.	Communication interfaces.

Connector layout

The front has a 144 x 32 graphical LCD, keypad, user-controlled LEDs, and system LEDs.
The bottom side has Ethernet, 1-Wire, RS232, RS485 port 1, RS485 port 2, wired M-Bus, analog inputs, and analog outputs.
The top side has power, digital inputs, digital outputs, and cellular antenna connections. The SD-card reader, DIP switches, and Mini USB-B service connector are also on the top side.
The SIM-card reader and configuration or termination jumpers are inside the enclosure.

Pin overview

Pin	Name	Description
5	SGND	Signal ground.
6	1-Wire	1-Wire bus for accessories such as ID-Button or temperature sensor.
7	1-Wire LED	1-Wire ID-Button LED.
8	SGND	Signal ground.
9	RSA 1	RS485 non-inverting signal for RS485 port 1.
10	RSB 1	RS485 inverting signal for RS485 port 1.
11	SGND	Signal ground.
12	RSA 2	RS485 non-inverting signal for RS485 port 2.
13	RSB 2	RS485 inverting signal for RS485 port 2.
14	TXD	Transmit data for the RS232 port.
15	RXD	Receive data for the RS232 port.
16	RTS	Request to send for the RS232 port.
17	CTS	Clear to send for the RS232 port.
18	M-BUS+	M-Bus signal.
19	M-BUS-/SGND	M-Bus ground / signal ground.
20	AOUT1	Analog output 1.
21	AOUT2	Analog output 2.
22	AIN1	Analog input 1.
23	AIN2	Analog input 2.
24	AIN3	Analog input 3.
25	AIN4	Analog input 4.
26	AGND	Analog ground.
27	PGND	Power ground, negative connection.
28	SUPP	Power supply, positive connection.
29	SUPP	Power supply, positive connection.
30	DOUT SUPP	Power supply for the digital outputs.
31	DOUT1	Digital output 1.
32	DOUT2	Digital output 2.
33	DOUT3	Digital output 3.
34	DOUT4	Digital output 4.
35	DOUT5	Digital output 5.
36	DOUT6	Digital output 6.
37	DOUT7	Digital output 7.
38	DOUT8	Digital output 8.
39	DOUT GND	Digital output ground.
40	SGND	Signal ground.
41	DIN1	Digital input 1. Default is PNP/normal positive input. Position S can be used for S0 input 1.
42	DIN2	Digital input 2. Default is PNP/normal positive input. Position S can be used for S0 input 2.
43	DIN3	Digital input 3. Default is PNP/normal positive input. Position S can be used for S0 input 3.
44	DIN4	Digital input 4. Default is PNP/normal positive input. Position S can be used for S0 input 4.
45	DIN5 / IGN	Digital input 5.
46	DIN6	Digital input 6.
47	DIN7	Digital input 7.
48	DIN8	Digital input 8.
49	SGND	Signal ground.

Controller supply

The controller must be supplied with 8-36 VDC from an external DC power source. Positive power is applied to SUPP and ground to PGND. The two SUPP terminals are tied together internally.

Pin	Name	Use
27	PGND	Power ground, negative connection.
28	SUPP	Power supply, positive connection.
29	SUPP	Power supply, positive connection.

PGND should only be connected to the external DC power source. SGND, DOUT GND, and AGND are filtered from the supply ground and tied together internally.

If a chassis or system ground is connected to SGND or AGND, wrong polarity on the supply lines can damage the internal ground connection.

Digital outputs

The eight digital outputs are protected high-side switches. The digital output control circuit is supplied from DOUT SUPP and DOUT GND. DOUT SUPP is not internally connected to SUPP and needs an external DC power source.

Pin	Name	Use
30	DOUT SUPP	Digital output supply, positive connection.
31-38	DOUT1-DOUT8	Digital outputs 1 to 8.
39	DOUT GND	Digital output ground, negative connection.

Maximum switchable voltage: 36 VDC.
Maximum current: 1.5 A per channel.
Maximum switchable inductance: 20 mH.
The outputs are protected against short circuit, overload, overvoltage, ESD, and inductive kickback.

Digital inputs and S0 inputs

The digital inputs are low-pass filtered and transient protected. To activate an input, connect a positive voltage between the input and SGND.

DIN1 to DIN4 can be configured individually as normal digital inputs or S0 inputs.
For FlexVander LX4 pro, the documented default is Position N: PNP/normal positive input.
Position S selects S0/NPN/contact input style for the relevant input.
The LX4 manual label S0IN1 means S0 input 1: the S0 pulse-input mode of the same physical terminal as DIN1.
S0 is an IEC62053-31 Class A pulse-input mode, typically used for meter pulse contacts between the input and SGND.
S0 inputs require application support and a minimum 16 VDC supply for full IEC62053-31 Class A compliance.
DIN6 to DIN8 do not work as high-speed IO.

Pin	Name	Use
40	SGND	Signal ground.
41	DIN1	Digital input 1. Default is PNP/normal positive input. The same terminal can be configured as S0 input 1 with Position S.
42	DIN2	Digital input 2. Default is PNP/normal positive input. The same terminal can be configured as S0 input 2 with Position S.
43	DIN3	Digital input 3. Default is PNP/normal positive input. The same terminal can be configured as S0 input 3 with Position S.
44	DIN4	Digital input 4. Default is PNP/normal positive input. The same terminal can be configured as S0 input 4 with Position S.
45	DIN5 / IGN	Digital input 5.
46-48	DIN6-DIN8	Digital inputs 6 to 8.
49	SGND	Signal ground.

Logic high is 8-40 VDC. Logic low is -5 to 3 VDC.

Analog inputs

The controller has four analog inputs. Each input can be configured for voltage measurement or current measurement with hardware jumpers. Inputs are voltage inputs by default.

Pin	Name	Use
22-25	AIN1-AIN4	Analog inputs 1 to 4.
26	AGND	Analog ground.

Voltage mode range: 0-10 VDC.
Current mode range: 0-20 mA.
Resolution: 12 bit.
Connect the input signal between AINx and AGND.
Avoid long unshielded wires and fast-changing signals routed in parallel with analog signals.

Analog outputs

The controller has two analog outputs. Each output can be configured for voltage output or current output with hardware jumpers. Outputs are voltage outputs by default.

Pin	Name	Use
20-21	AOUT1-AOUT2	Analog outputs 1 to 2.
26	AGND	Analog ground.

Voltage mode range: 0-10 VDC.
Current mode range: 0-20 mA.
Resolution: 10 bit.
Connect the output signal between AOUTx and AGND.
The supply must be at least 12 VDC for analog outputs to work according to specification.
Maximum load in current mode: 250 ohm.

Communication interfaces

RS232

The RS232 port is a general-purpose serial port with hardware handshake signals.

Pin	Name	Use
11	SGND	Signal ground.
14-17	TXD, RXD, RTS, CTS	RS232 transmit, receive, request-to-send, and clear-to-send signals.

RS485

RS485 is a multi-drop network with up to 32 nodes on one bus. Connect RSA, RSB, and the common signal ground for all nodes on the bus. Use shielded cable for best performance, protection, and noise immunity.

Port	Pins	Use
RS485 port 1	9 RSA 1, 10 RSB 1, 8 SGND	Port 1 is available on the pluggable screw terminals and is not shared with other sources.
RS485 port 2	12 RSA 2, 13 RSB 2, 11 SGND	Port 2 is available on the pluggable screw terminals and is not shared with other sources.

If the controller is used as an RS485 endpoint, install the relevant RS485 termination jumper to enable the onboard 120 ohm line termination resistor. RS485 termination is not installed by default.

1-Wire

The 1-Wire bus is available on the pluggable screw terminals for accessories such as ID-Button or temperature sensor.

Pin	Name	Use
5	SGND	Signal ground.
6	1-Wire	1-Wire bus.
7	1-Wire LED	1-Wire ID-Button LED.

The specified 1-Wire bus total weight is 65 m.

Wired M-Bus

The wired M-Bus interface is compliant with EN 13757-2/3 and supports communication with up to 20 slave nodes. The M-Bus interface needs an external supply to be operational.

Pin	Name	Use
18	M-BUS+	M-Bus signal.
19	M-BUS-/SGND	M-Bus ground / signal ground.

Hardware jumper reference

Open the controller only when internal access is required. Remove the SD card and USB cable before opening the enclosure.

Jumper	Function	Default	Other setting	Note
RS485 TERM1	Enable or disable 120 ohm line termination for RS485 port 1.	Not installed	Installed = termination enabled.	Install only when port 1 is an RS485 endpoint.
RS485 TERM2	Enable or disable 120 ohm line termination for RS485 port 2.	Not installed	Installed = termination enabled.	Install only when port 2 is an RS485 endpoint.
Ain 1-Ain 4	Analog input mode.	Not installed	Installed = current input mode.	Default is voltage input mode.
Aout 1-Aout 2	Analog output mode.	Position V	Position C = current output.	Position V = voltage output.
Din 1-Din 4	Digital input mode.	Position N = PNP / normal positive input.	Position S = S0/NPN/contact input.	Change each input individually only when the installed signal requires it.