Ultra Compact Remote Terminal Unit



Designed for outside plant and small facility applications, the WS400 is an environmentally hardened solution for remote alarm management where space is at a premium.

The WS400 provides a cost effective approach for smaller remote sites or outside plant environments

Features and Benefits

Fully Featured

  • Compatible with all the major Network Management Systems
  • Distributed reporting
  • Serial pass-through or terminal server functionality
  • Low power consumption
  • SNMP, TL-1, TABS, TBOS northbound interfaces


  • Compact wall mount form factor with moisture shield.
  • Extended temperature range for extreme cold or hot weather
  • Wire wrap termination is also available

Provisioning Made Easy

  • Visual LED display for Discrete Digital Inputs and Outputs
  • Remote and Local Firmware management
  • Remote and Local configuration management
  • 50 pin CHAMP style connector is pin to pin compatible with legacy Westronic products



CPU: 16 bit, 40 MHz x86 Microcontroller
Power (V): -48VDC (-24VDC available on request)
Power Consumption: 35-40mA idle, >75mA maximum @ -48VDC
Operating voltage range: -40 to -60 VDC


Dimensions (HxWxD): 7.6” x 10.2" x 1.4"
(19.30 cm x 25.90 cm x 3.55 cm)
Weight: 2.3 lbs (1.05 kg)
Termination Interface: 50 pin AMP connector or Wire wrap posts
LED indicators: Power, CPU Run, LAN activity, all Discrete Inputs and Control Outputs

Discrete I/O Module

Discrete Inputs: 8 opto-isolated
Protection: Common ground for all inputs
Sampling Rate 40 Hz
Input Voltage: Referenced to -48V DC
Input Current: ~1.0mA for each input
Logic Levels: 0 (Off) -15V DC through –48V DC (nominal voltage)
1 (On) -7V DC through +5V DC (nominal voltage)
Discrete Outputs: 2
Relay Type: SPDT Form C
Operation Types: Latched or momentary.
Momentary duration is programmable from 400 through 999 milliseconds
Contact Ratings: 0.5 Amps at 60 VDC
0.3 Amps at 110 VDC
30 Watts (maximum) switching power


Serial Ports: 1 user configurable
RS232/RS485 port (RJ11) and 1x RS232 Craft port (RJ45)
Ethernet: 1 Ethernet port (10BaseT-RJ45)
Miscellaneous: Telnet, TL-1 management interfaces

General Specifications

Storage Temperature: -40℉ to +158℉
(-40℃ to +70℃)
Operating Temperature: -40℉ to +158℉
(-40℃ to +70℃)
Relative Humidity: 5% to 90% non-condensing


Northbound Protocols - SNMP (includes re-trap method to resend current alarms)
- TL-1
- TABS (Serial and IP)
Miscellaneous - Serial pass-through functionality (terminal server)
- Total History is 40 alarm and system records with a First In, First Out rollover scheme
- Firmware version query and download
- Configuration version query, upload and download

Warranty and Support

- Two year parts and labour
- Unlimited support


Call us (403) 250-8304 or