BASR-8X BAS remote expansion modules can be daisy-chained together to BAS Remote Master (BASR-8M) to meet specific I/O requirements, and BASR-8M can be expanded to total of 32 Universal I/O points and 8 relay contacts to suit any building automation installation. Configurable Universal I/O can support BACnet/IP or Modbus/TCP points, and digital inputs can accept pulse trains in range of 0–40 Hz at 50% duty cycle to measure flow rates.