What are the specifications of SAGAs trigger inputs?

This article provides an overview of the specifications for all triggering possibilities that are available on SAGA.

As was described in the Whitepaper article 'What are triggers and how to use them?' there are 3 triggering options which are available for SAGA. This article will provide an overview on the specifications of each of those triggering options.


The 3 triggering options which are available on SAGA are 'Event marker button' ,  'DIGI input'  and 'TRIGGER input' as is summarized here

The DIGI input is an isolated input where a low-voltage TTL level signal (LVTTL) can be used to mark specific time points. The trigger is sample synchronous to all other data acquired by the Data Recorder. This input employs ‘negative logic’. That is, if the input is unconnected or high, the corresponding DIGI Trigger In value is logic ‘0’. Conversely, if the input is low, or shorted, the corresponding DIGI Trigger In value is logic ‘1’.

The trigger inputs is low-voltage TTL (LVTTL) compatible and electrically isolated within the device from all Data Recorder inputs and the subject.

Other specifications of the different trigger interfaces of SAGA are given in Table 1.



Please do not just connect anything that is active and/or connected to the mains. This can be dangerous. Contact support@tmsi.com for details concerning the trigger interfaces.


Table 1: Specifications per trigger option
  Event marker button DIGI input TRIGGER input
Device compartment Data Recorder Data Recorder Docking Station
Input on SAGA Orange button ODU 7 pin DSUB-26
Input voltage range [Volts] _____ 0 - 3.3 0 - 5.5
Low level [Volts] _____ ≤ 1 ≤ 0.8
High level [Volts] _____ ≥ 2.3 ≥ 2.4
Compatible trigger pulse _____ LVTTL TTL
Trigger type 1 bit 1 bit 16 bit
Frequency range _____ DC to 1/4 of sampling frequency DC to 1/4 of sampling frequency


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