Remote Input

Several Dionex instruments and additional cards provide remote inputs that enable a reaction to external events, such as an injection. The remote inputs are suitable for input voltages between 0V and +5V (TTL level).

As the remote input level is kept at +5V by internal card resistors (pull-up resistance), a simple contact closure relay can be used as an external signal source. This contact must be switched between GND and the respective remote input. If the contact is closed, the digital voltage is grounded. The relay itself is under a low current of approximately 1mA. Opening the contact restores the initial state.

If the signal source itself is active (TTL), the polarization of the remote input must be correct. Ground must be connected to ground, and the digital output must be connected to the remote input.

Installation is for the instrument that supplies the remote inputs. Determine clear installation names and numbers for the required remote inputs.

 Caution:

Do not supply higher voltages (>5V) to the remote inputs, as this may result in a malfunction of the microprocessor system on the A/D card, in the destruction of the input modules, or in further damage.

For an example, refer to Remote Inject.