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The BM-CEI-20 provides input point expansion capacity for all CS, CH and CW Series series controllers. The BM-CEI-20 has 20 input points, supports BACnet MSTP or Modbus RTU as a selectable function and is equipped with a RS485 port. The inputs include 10 Digital Inputs (DI) and 10 Universal Inputs (UI) supporting resistance based (10K or 20K) or digital dry contact.


  • Protocols Supported: BACnet MSTP Server, Modbus RTU Master
  • Universal Inputs: 10 x UI , 12-bit ADC with PGA. Resistance Mode : 400 – 300K Ohms (+/- 10 Ohms).
  • Thermistor sensor supported : NTC 10k Type 2/3 and NTC 20k (+/- 0.1 °C)
  • Modbus Baud Rate: Speed : (9.6K, 19.2k, 38.4K, 57.6K), Data Bits : 8 , Parity : Odd, Even, None
  • BACnet Baud Rate: Speed : 9.6K, 19.2k, 38.4K, 76.8K

Key Features