Getting Started > Connecting Autosamplers (AS)

Connecting Autosamplers (AS)

This chapter describes the most common wiring of autosamplers. The configuration varies depending on the type of chromatograph (GC or LC), sequence mode (ACTIVE or PASSIVE) and presence of optional control modules in your Clarity station.

Typical configurations are:

All aforementioned configurations are described in more details in the following chapters. If your device configuration does not correspond to any of these cases, contact us at

In ACTIVE sequence the start is controlled by the station. Clarity sends the permission signal to the autosampler and waits until the sampler acknowledges the injection. Data acquisition will be started after the confirmation signal has been sent back to Clarity and the permission to another injection is disabled.

In PASSIVE sequence the start is controlled by the autosampler. Clarity only waits for external start signal from the autosampler and then starts the sequence and data acquisition.

The START synchronization between Clarity and the autosampler is controlled via cable pins for inputs and outputs or by serial (RS 232) / USB / LAN port communication. The communication line is defined in System Configuration dialog by External Start Digital Input and Ready Digital Output functions. The System Configuration dialog is accessible from the Clarity main window through System - Configuration… command.

Data Inputs & Outputs group:

External Start Digital Input should be set to the device and its specific pin that givesClarity information about injection being performed. Subsequently Clarity starts Data Acquisition.

Ready Digital Output defines the device and its specific pin through which Clarity informs other parts of the system that sequence can be run.


System Configuration