同时，由于工业现场对抗电磁干扰和传输距离有比较高的要求，所以本设计采用CAN总线作为各个模块通讯的方式。
At the same time, because of high requirement of anti-electromagnetism interference and long distance this design uses CAN bus as the communication style of every module.
系统压力或差压变送器信号输出采用HART现场总线协议，数字信号传输通过RS485进行MODBUS通讯。
HART field-bus protocol is used in output of system pressure or differential pressure transmitter, digital signals is transmitted with MODBUS via RS485.
现场总线则是衔接智能现场设备和主动化系统地数字式、双向传输、多分支构造地通讯收集，其根底是智能仪表。
Fieldbus intelligent field devices are connected and digital automation system, two-way transmission, multi-branch structure of the communications network, based on smart meters.
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