TSVME-405-V1R3 Mercury Computer Systems Industrial I/O VME Module

The Themis / Tekelec Systems TSVME-405 Industrial I/O VME Module is a TTL level input/output VMEbus board built around four 68230 or PI/T (Parallel Interface/Timers) circuits which provides three major types of applications :

• Centralizing of information from various industrial captors via interface boards located outside the VMEbus system
• Command of industrial outputs via power boards which are also remotely installed
• Fast transfer of parallel data between two systems

The TSVME405 board has 88 input/output lines distributed as follows:

• 8 x 8-bit I/O ports which may be grouped in twos of fours
• 4 x Timer outputs, each capable of generating an interrupt with its own vector on the VMEbus
• 4 x Clock or Timer enable inputs
• 8 x Port interrupt inputs of Handshake inputs
• 8 x Port interrupt inputs or Handshake outputs

Output port/connector interfacing with the TSVME-405 is achieved by programmable tri-state input or output buffers, or open collector output buffers. These buffers are also designed to leave the lines undisturbed when the board is off. The electrical characteristics of the TTL I/Os are compatible with the specifications as defined by the IEEE 488 standard. Each input line can be closed on a resistance network to the ±5V and to the ground. It is thus possible to adapt inputs to the impedance of the transmission line. The hysteresis of the input buffers guarantees good protection against transmission interference. protection against transmission interference.