The VMIVME-Repeat S-485 is a slave repeater link module engineered to extend VMEbus serial communication across distributed chassis environments. Installed in slot 1 of the slave chassis, it partners with the VMIVME-Repeat M-485 master module to regenerate VMEbus signals and maintain data integrity over extended distances. The two-board architecture isolates bus segments, preventing signal degradation and enabling scalable system expansion up to 19 x 19 slots using 20-slot backplanes in star configuration.
Technical Specifications
Signal Regeneration & Performance
• Regenerates 24 VMEbus signals including data lines (D00–D15), address lines (A01–A23), control signals (AS*, DS0*, DS1*, DTACK*, WRITE*), all interrupt levels (IRQ1*–IRQ7*), and system signals (SYSFAIL*, SYSRESET*, SYSCLK, GND)
• Propagation delay: approximately 400 ns over 5 ft cables; adds 4 ns per additional foot
• Differential line drivers and receivers deliver ±7 V noise rejection
• Software transparent operation
Data Transfer & Addressing
• Supports 8- and 16-bit data transfers
• Supports 16- and 24-bit addressing modes
• All seven VMEbus interrupt levels supported
• Maximum cable length: 2,000 ft
Electrical Characteristics
• Power requirement: +5 V at 2.0 A maximum
• Double Eurocard form factor with DIN connectors
Environmental Specifications
• Operating temperature: 0 to 55 °C
• Storage temperature: -20 to 85 °C
• Relative humidity: 20 to 80 percent, non-condensing
• Convection cooling
– Key Features
• Enables VMEbus master-to-slave chassis communication across extended distances
• Slave-only VMEbus configuration support
• Reduces electrical noise impact in multi-chassis deployments
• Plug-and-play integration into existing VMEbus architectures
– Typical Applications
• Distributed VMEbus I/O control systems requiring master-slave separation
• Long-distance serial communication links in industrial test and measurement systems
• Multi-chassis VMEbus configurations with stringent noise immunity requirements
– Compatibility & Integration
Designed for use with VMIVME-Repeat M-485 master module. Installation requires placement in slot 1 of slave chassis. Supports expansion topologies up to 19 x 19 slot configurations.
