Brooks Instrument”s 4800 Series mass flowmeters and mass flow controllers now feature digital communications capabilities in addition to analog and RS232 communications. Digital communications include Profibus or RS485 in a small field-installable module that mounts directly on top of the 4800 Series device. Profibus supports both DPV0 cyclic and DPV1 acyclic data communication. It has a standard nine-pin female D-connector for signal and an M5 connector for power. Baud rates from 9600 up to 12M are supported and automatically detected. The 4800 Series with RS485 has a physical layer with proprietary “S-Protocol” based on HART command set. It has a standard 15-pin male D-connector for signal and power. Baud rates from 1200 to 38.4K are supported with a top accessible rotary switch for baud rate selection.