How can I start acquisition from Sequence without Autosampler?

Normally, the Active Sequence sends a command to the sampler (over serial line or by digital output) and waits for the start signal from the detector (again over the communication line or digital input). The digital input and output used for this are specified in the Clarity Configuration - Ext. Start Dig. Input (digital input) and Ready Dig. Output (digital output).

In case the injection is performed by some controlled valve or instrument (typically EAS analyzers) not supporting the Injection marker by digital output, the common solution when using DataApex A/D board is to interconnect the digital output set for Ready Out signal directly to the digital input set for Start In command. The digital input on the instrument starting the next run will be connected in parallel. With controlled valve, the injection is then performed during the actual run by switching the valve (or valves) from Clarity Event Table.

In case no A/D board is used and the devices are not offering those digital inputs and outputs (for example with Agilent GC 5890), the suggested workaround will be to use the DataApex Virtual Digital Input Output Loop (auxiliary device, requires A24 LC or A23 GC Control license) to simulate the input/output needed - (those are virtually interconnected).

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Last updated: 2011-04-27 | webmaster