S::CAN UV-Vis Spectrophotometer X2 Integration Guide

The S::CAN UV-VIS Spectrophotometer is a submersible UV-Vis spectrophotometer that analyzes spectral data to provide measurements for the following: nitrate (NO3), nitrite (NO2), chemical oxygen demand (COD), biochemical oxygen demand (BOD), total suspended solids (TSS), dissolved hydrogen sulfide (H2S), and many more. The sensor is compatible with the X2 data logger via the Modbus-RTU communication protocol and the RS-485 sensor interface.


Figure 1: S::CAN SpectroLyser UV-Vis Monitor.


Sensor Terminal Connections


Figure 2: S::CAN con::nect junction box.


The con::nect junction box is utilized with the S::CAN UV-Vis Spectrophotometer to ensure power supply and sensor communication with the X2 data logger. Information regarding the wiring connections may be found in the table and images below:

Cable ConnectionWire ColorTerminal ConnectionSignal
NexSens Sensor Cable
(Sensor Power: X2 Connection- P1)
Red+ DC inSensor Power
Black– DC inSensor Ground
Blue*+ DATA485A
Green*– DATA485B
NexSens Wiper Power Cable
(Wiper Control: X2 Connection- P2)
RedNC (Top)Wiper Control
Black– 12V OutWiper Ground
S::CAN Wiper CableRed+ 12V OutWiper Power
Black– 12V OutWiper Ground
PinkNC (Top)Wiper Control

*150 ohm resistor jumped between 485 signals

Figure 3: S::CAN wiring schematic into con::nect junction box.  From left to right, the cables are as follows: NexSens Wiper Cable, NexSens Sensor Cable, and S::CAN Wiper Cable.


*Note: The third and left-most sensor gasket is custom with NexSens integration.


Software Communication

Communication to the Io::Tool software will require an external power  source (12VDC) via the UW8-Flx cable connection to the NexSens sensor cable on the S::CAN sensor.

  1. Remove the NexSens Sensor Cable from the P1 port on the X2.
  2. Plug the NexSens Sensor Cable into the receptacle on the UW8R-FLx external power cable.
  3. Connect a LAN ethernet cable between the ethernet ports on the con::nect junction box and a PC.
  4. Attach the flying leads of the UW8R-FLx to a 12VDC power source to power the S::CAN sensor.

Figure 4: Communication with Io::Tool software using ethernet connection and external power connected between the NexSens Sensor Cable on the S::CAN and a UW8-FLx cable to the power source.


  1. Open Network Connection to modify the Properties of your Ethernet connection.

Figure 5: Adjust ethernet properties for S::CAN connection.


  1. Select Internet Protocol Version 4 and push the button Properties.

Figure 6: Internet Protocol Version 4



  1. Click Use the following IP address and enter the necessary IP address from the table below, based on the method of connection.

Figure 7: Internet Protocol Version 4 Properties


Connection MethodIP address of spectrometer*Remark
via WLAN192.168.43.1default address; password = spectrolyser
via Bluetooth192.168.44.1default address
via LANto be checked on DHCP ServerDHCP active on spectrometer probe per default
via LAN192.168.42.10 (Fixed static IP)fall back (static) if network without DHCP Server (e.g. when connecting directly with notebook)

*Follow page 11 of the con::nect manual to change the network settings on the spectrometer probe.


  1. Enter the IP address of the spectrometer probe into a web browser to start the Io::Tool.


S::CAN SpectroLyser Internal Setting Requirements

The following sensor settings are required for communication with the X2 data logger. These settings are default and should not be changed within the software; however, if the S::CAN sensor Modbus address (default = 4) interferes with any other Modbus sensor, this address must be changed before the sensor is detected by the X2. 

  • Baud Rate: 38400
  • Parity: Odd
  • Stop Bits: 1
  • Default Address: 4


X2 Connection

Based on the X2 sensor script, the NexSens sensor cable must be plugged into port 1 (P1) on the X2 data logger and the NexSens wiper cable must be plugged into port 2 (P2). Follow the schematic below for proper connection to the X2 data logger. Ensure that this configuration is correct during sensor detection. 

Figure 8: S-CAN X2 Connection Schematic. S::CAN sensor (NexSens Sensor Cable) must be plugged into P1 on the X2. S::CAN wiper cable must be plugged into P2 on the X2.


Applicable Systems

UV-Vis nutrient measurements from the S::CAN sensor are useful in various environmental monitoring applications.