Remote I/O Communication Model 


The OSS-20 extends your BACnet or ModBus network when your application requires additional inputs and outputs on a physical controller. Combining the 20 inputs and outputs of the OSS-20 with your Building Automation System provides simple expansion of a new or existing controller and reduces unnecessary costs of additional components.

Use the on-board override switches to manually force the output states during the start up or service calls that demand immediate intervention on a controlled or operated peripheral. All outputs are supervised, therefore, if the output is “forced on” by the override switch, the output status is sent via the network. On-board LEDs help track and diagnose and input or output activity during operation.



Technical Specifications


 Power & Communication
• 24Vac or 30Vdc supply
• BACnet ® MS/TP port
• BACnet ® MS/TP or Modbus communication port

Inputs & Outputs
• 8 universal inputs
• 2 digital inputs
• 2 universal outputs (supervised)
• 2 analog outputs (supervised)
• 6 digital outputs (supervised)

• 10 override switches to manually control each output
• LED status indication of each input and output
• DIN rail mounting
• Removable, non-strip, raising clamp terminals

Network Communication

• BACnet® MS/TP or Modbus communication port
(selectable via DIP switch)
• Select MAC address via DIP switch or via network

• MS/TP @ 9600, 19200, 38400 or 76800 bps
• Automatic baud rate detection
• Automatic device instance conguration
• Copy & broadcast conguration to other CMMB modules

• Modbus @ 9600, 19200, 38400 or 57600 bps
• RTU Slave, 8 bits (congurable parity and stop bits)
• Connects to any Modbus master