Abaco Systems / VMIC VMIVME-Repeat S-485/32 Slave Repeater Link Module

The VMIVME-Repeat S-485/32 is a slave repeater link module that extends VMEbus system connectivity over distances up to 2,000 feet (609 meters) using RS-485 differential signaling. Installed in slot 1 of a slave VMEbus chassis, this double Eurocard module regenerates critical VMEbus signals and interrupt levels, enabling master-slave communication between separate chassis configurations. The module supports 16- and 24-bit addressing with 8- and 16-bit data transfers, making it ideal for distributed industrial control and embedded systems requiring long-distance VMEbus expansion without signal degradation.

Technical Specifications

• Module Type: Slave Repeater Link Module


• Form Factor: Double Eurocard, Single Wide VMEbus Module


• Communication Protocol: RS-485 with differential line drivers/receivers


• Addressing: 16- and 24-bit VMEbus addressing supported


• Data Transfers: 8- and 16-bit transfers


• Maximum Cable Length: 2,000 feet (609 meters)


• Propagation Delay: ~400 ns at 5-foot cable length; add 4 ns per additional foot


• Noise Rejection: ±7 V differential line driver/receiver capability


• Power Consumption: +5 V at 2.0 A maximum


• Operating Temperature: 0 to 55 °C


• Storage Temperature: -20 to 85 °C


• Relative Humidity: 20 to 80 percent, non-condensing


• Cooling Method: Convection

Key Features

• Regenerates 21 critical VMEbus signals including data lines (D00–D15), address lines (A01–A23), interrupt levels (IRQ1*–IRQ7*), and control signals


• Supports all seven VMEbus interrupt levels with daisy-chained IACKIN*/IACKOUT* architecture


• Enables star expansion configurations up to 19 × 19 slots using 20-slot backplanes


• DIN-type I/O connectors with inexpensive ribbon-cable interconnects


• Operates as slave-only configuration within two-board repeater system

Typical Applications

• Extending VMEbus real-time control networks across separate equipment racks


• Distributed I/O module control in industrial automation systems


• Multi-chassis VMEbus expansion with single master chassis supervision

Compatibility & Integration The VMIVME-Repeat S-485/32 operates as the slave component paired with the VMIVME-Repeat M-485 master module. Cable assemblies are available in lengths from 5 feet to 250 feet. Installation in slot 1 of the slave chassis is mandatory for proper VMEbus signal regeneration and interrupt handling.