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.
为了加快工作，基金会现场总线和ISA达成了一个交叉许可协议，允许这两个组织就无线网络进行合作。
To expedite the work, the Fieldbus Foundation and ISA have entered into a cross-licensing agreement allowing the two organizations to collaborate on wireless networks.
本文首先介绍了现场总线CAN通信协议。
Introduce the communication agreement of field bus CAN at first.
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