Multiple bus protocols, suitable for flow meters, flow controllers, and pressure controllers
Beijing Accuflow Technology Co., Ltd. (ACCU) It is a manufacturing enterprise focused on customized research and development, specializing in the development of thermal principle, differential pressure laminar flow principle, and Coriolis principle mass flow controllers/meters. The company's products can directly measure the mass flow of gases, liquids, and supercritical fluids, with a minimum liquid range of 20g/h and a maximum gas range of 10,000 slm, suitable for laboratories and complex industrial environments.
At the same time, ACCU also develops related automation control systems such as pressure controllers/meters and multivariable mass flow meters.
Currently, the main fieldbus protocols used internationally for low-voltage electrical products include: Profibus-DP protocol developed by Siemens in Germany; Devicenet protocol developed by Rockwell in the USA; Modbus protocol developed by Schneider in France; Cc-Link protocol developed by Mitsubishi in Japan; Asi protocol (mainly transmitting switch signals); EtherCAT protocol (Ethernet control automation technology), and others.
The following focuses on the first three bus protocols and their applicable products.
1. Profibus-DP protocol: 
Profibus-DP is a polling communication method between master and slave stations, used for communication between device-level control systems and distributed I/O. It clearly defines how user data is transmitted between bus stations and is mainly applied in unit-level and field-level communication in manufacturing automation systems.
Profibus-DP bus communication has a relatively high speed, but the protocol is complex, costly, and the communication method is relatively single. It is applied in our company's 20 series products.
■ ACU20FE Coriolis Mass Flow Meter
■ ACU20FD High-Precision Mass Flow Controller
■ ACU20P Pressure Controller/Meter
2. Devicenet protocol:
Devicenet is an application layer protocol based on the CAN bus. While providing interchangeability among similar components from multiple suppliers, it reduces wiring and installation costs and time for industrial automation equipment. Due to its built-in power supply, it is suitable for lower-level field applications.
Devicenet bus communication speed is lower than the first two bus protocols, but the protocol is relatively simple, cost-effective, and the communication method is relatively "flexible." It is applied in our company's 20 series products.
■ ACU20FE Coriolis Mass Flow Meter
■ ACU20FD High-Precision Mass Flow Controller (pictured above)
■ ACU20P Pressure Controller/Meter
3. Modbus protocol:
Modbus is a serial communication protocol supporting traditional RS-232, RS-422, RS-485, and Ethernet devices (our company only provides RS-232 and RS-485). It transmits data via wireless data radios and is mainly used in electronic devices, notably for communication between PLCs and inverters.
Modbus bus communication is simpler and low-cost but has relatively weaker functions and a smaller communication range. It is applied in our company's 10 series (except the 10FA series) and 20 series products.
■ ACU10FD Digital Mass Flow Controller (left image)
■ ACU10FC Differential Pressure Mass Flow Controller (right image)
■ ACU10HT High-Temperature Mass Flow Controller
■ ACU10L Liquid Flow Controller
■ ACU10P Pressure Controller/Meter
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