VME-2540 Intelligent Counter/Controller

24-channel slave I/O module

VME-2540 Intelligent Counter/Controller


The VME-2540 Intelligent Counter/Controller (ICC) is a VMEbus slave I/O module designed to provide high-precision digital measurement and function generation capability for VMEbus systems with a simple, consistent memory-mapped user interface.

  • RS-422 differential interface with support for single-ended TTL inputs
  • Options allow configurations of 4, 8, 16, and 24 interfaces
  • On-board 15 MHz 68HC000 CPU
  • A32/A24/D32/D16/D8 (EO) VME slave interface, 64 Kbyte VMEbus memory window
  • Timer/periodic VMEbus interrupter - 0.0076 to 1,000 Hz
  • Quadrature position measurement - sin/cos up to 1 MHz, 32-bit counters, limit/modulo checking Integer period/pulse-width measurement 16- and 32-bit, discrete or continuous; low data transport lags
  • Square wave/pulse train generation - 0.0076 Hz to 2.5 MHz
  • Period/pulse-width measurement 400 ns to 8.5899 x 106s (32-bit floating point), 400 ns to 858s (32-bit unsigned integer)
  • Event counting - up to 4 giga events
  • Frequency measurement 1.16 x 10-3 Hz to 2.5 MHz


Form Factor
24 Input/Output
Data Transfer Bits
8, 16, 24, 32
I/O Voltage Range
RS-422, TTL


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