The SMX900 is a compact, rail-mounted license-free radiomodem / RTU operating in the 902-928Mhz ISM band. With expandable Modbus and Allen Bradley DF1 addressable I/O modules, built-in RS-232 / RS-485 / RS-422 and support for up to 254 Slave connections, the user can easily set up complex Point-Multipoint SCADA communication systems. The SMX900 can also operate in End-to-End I/O Telemetry.
Each site consists of a transceiver unit along with a maximum of 8 I/O expansion modules. There are 5 types of expansion modules to choose from: AI4, A04, DI8, DO8, A8D4.