![]() ![]() There are a few differences to be aware of between the Modbus TCP/IP protocol and the “Modbus RTU Serial via raw TCP/IP socket” approach. Many Modbus master applications have another option (called Remote Telnet Server, Serial Device Server etc.) that allows sending unmodified Modbus RTU Serial messages through a TCP/IP socket to any Serial Device Server (SDS) or Serial Device Adapter (SDA), not just Modbus TCP/IP gateways. Note that Modbus TCP/IP is not the only way to do this. ![]() The Modbus TCP/IP protocol facilitates communication with Modbus TCP/IP gateways over an Ethernet LAN and the Internet. The WattNode ® Modbus ® meter’s TCP-RTU communications option emulates the Modbus TCP protocol over RS-485, allowing the use of low-cost serial-Ethernet gateways.
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