It was developed in the late seventies and has stood the test of time. The nice thing about the Modbus standard is its flexibility and the ease with which it can be implemented and used. Its primary purpose of Modbus is to exchange data between slave devices and a master. To put this into context, Mach3 is the Master, ModIO s, VFDs, and other devices are the slaves. Modbus implements a number of protocols, namely, serial RTU/ASCII and Modbus/TCP. The serial protocols may be transmitted over standard RS232 and/or RS485 interfaces. Serial RTU is the most common protocol used with Mach3, although Modbus/TCP is gaining popularity. ![]() ![]() Both Protocols may be used simultaneously with Mach3. It should be noted that Serial/ASCII is not implemented in Mach3. Figure 1 below illustrates an Architecture Overview of a Mach3 Modbus setup.ΔΆ Architecture Overview RS-232 Serial Modbus Master Mach3 TCP Ethernet Lan/Wan RS485 Serial Serial Modbus Slaves ModIO(s), PLCs TCP/IP Modbus Slaves ModIP(s), PLCs Figure 1 Architecture Overview Query/Response Cycle Modbus works on a query/response cycle. Only the master (Mach3) can initiate communication. The slaves just respond to the masters queries.
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