FEATURES

• Supports Polled Response SCADA Networks
• Data Rates up to 120 Kbps
• Up to 24 Channels; Can be Cascaded
• Anti-Streaming Capabilities on Each Channel
• LED Indicators for Each Channels Tx & Rx Status
• Standalone or Rackmount

APPLICATIONS

The LT8916 is often used in SCADA applications with a Star topology to link a SCADA Host to RTUs. The LT8916's RS-232/RS-422 user ports are extended via either a fiber modem or multiplexer. When the Host Polling Device sends information to the LT8916 via the RS-232/RS-422 Host Port, it will broadcast to each of the RS-232/RS-422 user ports. The addressed remote device(s) will then respond back to the Host Device.

DESCRIPTION

Designed specifically for SCADA and process control applications with a Star topology, the LT8916 Broadcast & Receive Device broadcasts & receives information from remote devices. Transparent to all data sent in either direction, it is typically used to link SCADA Hosts to remote terminal units (RTUs) via fiber optic or metallic cable.

The host port on the LT8916 receives a broadcast message from the host controller and broadcasts the message out through up to 23 ports at the same time. The broadcast message (sent by SCADA HOST) has embedded Identification (ID) numbers for each RTU. Only the RTU that matches this ID number will respond.

An "Anti-Streaming" capability is provided for each channel to prevent a single node failure from disabling the system. A channel will be disabled if it transmits a Tx data string beyond a set length of time. Once OFF, it will attempt to resume communications after the jam condition ends.

The LT8916 supports data rates up to 120 Kbps and is compatible with both RS-232 and RS-422 interfaces. Interfaces can be mixed or matched in increments of four. The LT8916 is available in 8-Channel (7 + Host), 16-Channel (15 + Host) and 24-Channel (23 + Host) versions.

Diagnostic LEDs for Tx and Rx are included for each channel. Additional LEDs are provided for Alarm, Power A, Power B, and Vcc. Connectors are RJ-11 Female. Power is 12VDC@ 400mA or 115/230VAC with an external power cube. The LT8916R PC Card version fits into rackmount card cages.

TECHNICAL SPECIFICATIONS