Installing the A/D Converter Card
Remote Inputs

 Tips:  

The A/D converter card is no longer available from Dionex. However, as A/D converter cards may still be used in the field, refer to the corresponding installation instructions below.

This card is not supported under Windows Vista or later.

To enable a reaction to external events (such as sample injection), the A/D converter card is fitted with remote (digital) inputs. These remote inputs are designed for an input voltage between 0 and +5V (TTL level). Any higher voltage this may cause malfunction of the microprocessor on the A/D converter card, damage to the input elements for the digital signals, or more serious damage.

Without an externally connected voltage source, internal card resistors keep the remote input level at +5V (pull-up resistance). Therefore, it is possible to use a contact closure relay, without an additional voltage source. This closure has to be between GND and the respective remote input. When the relay is closed, the digital voltage is grounded. The relay itself is under a low current of about 1mA. If the signal source itself is active, i.e., emitting voltage, the polarization of the remote input must be correct; that is, make sure that the ground of the signal source is connected to the ground of the A/D converter card and that the digital output of the signal source is connected to the card's remote input.