S2UI28 Wall Mounted User Interface Terminal



The S2UI28 is a wall-mount Customizable User Interface Terminal (2.8" TFT LCD with Touch Screen) that provides interaction between the User and the User’s Building Management System (BMS).   The device is configurable to display various N2 (or MS/TP) data and/or allow the user to modify this data. Further, the S2UI28 contains the following on-board peripherals which can be mapped backed into the BMS:
a. Occupancy (PIR) Sensor
b. Ambient Light Level Sensor (Values in Lux and Foot-Candles)
c. On-board Temperature Sensor
d. Off-board JCI Compatible Platinum 1K Temperature Sensor for direct connection to external Controllers (VAVs, etc)
e. Two (2) 12- 24 AC/DC compatible Binary Inputs


Johnson Control Users (N2 Bus HMI, N2 Bus Display)


The S2UI28 has direct support for JCI's N2 bus as both a Slave and as a N2 Bus Master (Supervisory Controller).  As a N2 Slave the S2UI28 allows the Supervisory Controller to read and write to the S2UI28 to display various BMS information.  As a N2 Master (a mini Supervisory Controller), the S2UI28 can be connected to a small N2 network to display and modify various N2 field device data points (AI, AO, BI, BO, etc).

Small Quantity Pricing: $425




Part Number:

  • S2UI28-N2S (N2 Slave Version) - Available Now
  • S2UI28-N2M (N2 Master Version) - TBA
  • S2UI28-MSTP (BACNet MS/TP Version) - TBA


  • 2.8" TFT LCD 240x320,
  • LED Backlit with 262K Colors
  • Integrated Touch Screen


  • Temperature -40 C to +60 C
  • Humidity: 10 - 95 % RH (non-condensing)


  • 3.56" W x 5.75"H x 1.2” H
  • 9.04cm W x 14.60cm H x 3.05cm H


  • 6.5 oz
  • 187 grams
Power Requirements:
  • 18-24 V AC/DC @ 300 mA (Max)

Supported Protocols:

  • JCI N2 Open (Slave and Master)
  • BACNet MS/TP
  • HTTP

Data Interfaces:

  • One (1) 3-Pin Electrically isolated RS-485 Interface
  • One (1) USB Mini-B
  • One (1) 10/100 Ethernet

On-Board Sensors:

  • One (1) Ambient Light Level Sensor
  • Range 0 to 3000 Lux or 0 to 280 Foot-Candles
  • One (1) Occupancy Sensor
  • Two (2) Binary Inputs (12-24 AC/DC Compatible)
  • One (1) Platinum RTD 1K ohm for direct connect to external controller
  • One (1) Temperature sensor (+/- 1 deg accuracy) read as a AI