Modbus RTU Slave Over TCP
Modbus RTU Slave Over TCP is implemented in a similar way to the Modbus TCP server. It is important restriction that the Modbus RTU protocol is developed for the serial link layer, allowing a single Master query. However, the fact that the methods used in the long-established old systems are supported in the inSCADA platform facilitates migration to the inSCADA platform
Figure 1 : Modbus RTU Slave Over TCP
As shown in Figure 1, an HMI panel with serial port can act as a master and communicate with the inSCADA platform. The terminal server provides an Ethernet-to-serial conversion and a transparent transition in the link layer. The implementation of Modbus RTU Slave Over TCP is the same as the configuration steps followed in the Modbus TCP protocol. Simply select "Modbus RTU Slave Over TCP" as the protocol. See Modbus TCP.