USR-M511User Manual Technical Support:
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Jinan USR IOT Technology Limited
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data from serial port Modbus Slaves and reply stored data to network side Modbus Masters directly.
4. Modbus work in Modbus Slave mode can apply to four applications: One Master to one Slave; one Master to
multiple Slaves; multiple Masters to one Slave; multiple Masters to multiple Slaves.
Application diagram as follows:
Figure 14 One Master to one Slave
User can change Modbus Slave mode parameters by web server as follow:
Figure 15 Modbus Slave mode configuration
A.Work mode: Four types work modes.
B.Enable Modbus Over TCP/IP: Open this function, M511 will work in transparent transmission and don’t
proceed protocol conversion. If network side protocol is Modbus RTU/ASCII, this function must be used. If
network side protocol is Modbus TCP, this function can’t be opened.
C.Enable Memory Function:When open this function, M511 will automatically update the stored data from serial
port Modbus Slaves and reply stored data to network side Modbus Masters directly.
D.Local Port Number: Default is 502 and don’t need change.
