Abaco Systems / VMIC VMIVME-Repeat S-485 Slave Repeater Link Module

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

• 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.