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.

• License Free 902-928 MHz Spread Spectrum Radiomodem
• 20+ Mile Range
• Modular Expansion to Modbus RTU or Allen Bradley DF1 I/O Modules
• Multiple Operating Modes: Point-Multipoint (Modbus RTU or AB DF1), I/O Telemetry or Transparent Serial
• RS-232 / RS-485 / RS-422
• Configurable as Master, Slave or Repeater
• Supports up to 254 Slave connections
• 1200 - 19,200 Baud Data Rate
• 9-30VDC Operation
• -40°C to 85°C Operating Temperature
• DIN Rail Mounted Modules
• Link Failure Relay
• Autorouting for Network rendundancy and increased reliability
• See Point-to-Point Version IO-900

Bentek Systems' I/O Modules can be attached to the SMX900 via the I/O bus as shown:

The following figure shows two I/O expansion modules, the AI4 and the DO8, connected to the SMX900:

• SCADALink SMX-900 Manual V1.00b
• SMX-900/SM-900 Configuration Software