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AT-2501 Connectors

Optical Trigger Distribution Module

Please contact us for pricing and delivery options.

The AT-2501 is a CompactRIO module for distributing electrical and optical trigger signals between cRIO chassis and other instruments. Each output has adjustable delay, pulse-width, polarity and pulse-train generation. The optical connectors can be configured as one input and three outputs, or two inputs and two outputs.


· Fibre-optic input and output: trigger or data
· Impedance-matched trigger input and output
· Precise signal-based synchronisation (2.5 ns rms jitter)
· Minimal programming to build complex trigger regimes
· Can synchronise with precision clocks (GPS, White Rabbit etc)
· Choice of fibre-optic connectors: ST or SMA
· Optical communication distance greater than 1 km possible 

Application Examples

Trigger distribution with delay compensation

AT-2501 Trigger Module in Setup
Typical trigger distribution example

Digital communication bridging potential differences

AT-2501 Trigger Module Data Communication


  • Science research labs 
  • Large physics facilities
  • Energy/electrical network infrastructure
  • Test and measurement labs
  • Medical physics installations
  • Materials testing labs


  • Master trigger distribution
  • Trigger local instrumentation via electrical connection
  • Trigger remote cRIO chassis via fibre optic connection
  • Ground loop elimination
  • Electrical isolation between cRIO chassis at different potentials (HV applications)
  • DAQ synchronisation between multiple cRIO chassis with propagation delay compensation
  • Optically-coupled communication (RS232, RS485 etc) when using FPGA mode
  • Complementary to local cRIO master clocks
  • Optically-isolated high-speed digital IO
  • Time-based or signal-based synchronisation
  • Cost-effective method to synchronise (signal-based) with PXI chassis (SPEXI* and future FMC OTD card)
  • Generate delays, pulse trains etc with simple programming - no complex coding required

    *SPEXI: Simple PXI express FMC Carrier Board (SPEXI) CERN OHWR project


· TTL (50 Ohm switchable)
· Optical (1 or 2), 820 nm
· cRIO FPGA (via DIO) 

· TTL (can drive 50 Ohm)
· Optical (2 or 3) 820 nm
· cRIO FPGA (via DIO)

Maximum Symbol Rate
· 40 MBd (FPGA-controlled)

Pulse Width 
· 10 ns min, 42s max.  
· Width step size : 10 ns

· 10 ns min, 42s max 
·  Delay step size : 10 ns

Edge Jitter 
· 2.5 ns rms typical

Pulse Train
· 2 to 65536 pulses
· Adjustable delay, width and pulse rate

· Rising or falling edge triggered 

Electrical connectors

Fibre connectors 
· ST or SMA

Code librairies
· Library and examples provided for LabVIEW

*Preliminary specifications are subject to change for final product