Vermont Energy Control Systems

Practical monitoring and control for the real world


Vesta VSCU-4

The Vesta VSCU-4


Power Supply UL listed wall mount power supply (included), 115vac nominal
Power Consumption 3W nominal
Sensor Inputs 16 Channels, 0-2.5V, 12 bit resolution
Analog Outputs 4 Channels, 0-20ma current loop, 12 bit resolution
Discrete Inputs 32 Channels, 5V excitation, 2.1V nominal threshold
Discrete Outputs 32 Channels, 12V supply, 200mA sink per channel


The software in the Vesta system is open source, licensed under GNU General Public License (GPL). Vesta systems are delivered with all source code. Users may modify or add to the Vesta software. A sample application template is provided.

  • Embedded Linux, kernel version 2.4
  • Apache Web Server
  • Telnet remote terminal access
  • FTP and NFS file transfer
  • Web-based interface for monitoring, control, and configuration
  • Battery-backed real-time clock, automatically synced to Internet time servers
  • Web-based software update capability

RM-1207 Relay Module

The RM-1207

The RM-1207 is a general purpose relay module containing four relays that can be controlled by the Vesta controller. It's packaged in a standard 4" electrical 'job box'. All contacts are brought out to screw terminals. The screw terminals can accommodate up to 14ga wire. Stranded wire is suggested.

the RM-1207, opened
Relays 4
Contact Configuration (each relay) DPDT (double pole / double throw)
Relay Contact Rating 8A at 250Vac, 8A at 30Vdc
Suggested Current Limit 5A momentary, 3A continuous

TS-1058 Temperature Sensor

The TS-1058 sensor is the standard temperature sensor used in the Vesta system. It's based on the National Semiconductor LM61C chip. It has low noise and good stability over time. It covers a wide range of temperatures and can be calibrated to achieve very high accuracy if necessary.

Connector Type Standard RJ11 (6P4C Flat) crimp connector
Cable Type Standard RJ11 4 conductor flat cable
Operating Temperature Range -22 - 212°F (-30 - 100°C)
Typical Error Over Full Range +/- 2°F (+/- 1°C)
Worst Case Error at Room Temperature +/- 3.5°F (+/- 2°C)
Worst Case Error Over Full Range +/- 5.5°F (+/- 3°C)
Typical Error Over Full Range After Calibration +/- 0.6°F (+/- 0.3°C)