MODBUS APPLICATION PROTOCOL SPECIFICATION V1
IP Ethernet Physical layer Ethernet II /802.3 EIA/TIA-232 or EIA/TIA-485 Master / Slave Physical layer MODBUS+ / HDLC Other Other Figure 1: MODBUS communication stack References 1. RFC 791, Internet Protocol, Sep81 DARPA 2 Abbreviations ADU Application Data Unit HDLC High level Data Link Control HMI Human Machine Interface
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