Generic Device Driver
The "Inject Device" Device Type

With the Standard Device device type, it is not possible to perform the inject command correctly (as the return signal sent by the autosampler after the injection cannot be processed). For this reason, a special device type is required to control autosamplers for which a separate device driver is not available.

The predefined functions of the Standard Device type (see  The "Standard Device" Device Type) are also required for autosamplers. In addition, the Volume and Position properties and the Inject function are required for devices of the Inject Device type.

• Volume: Chromeleon always sets this property to the sample volume to inject.

• Position: Chromeleon always sets this property to the sample position from which to inject.

• Inject: This function starts the injection procedure. As it does not have parameters, the current injection parameters of the Volume and Position properties are used.

After the Inject command, Chromeleon waits for the Inject Response from the driver, indicating that the injection process is complete. Only then the time program starts.

The device driver provides two possibilities to supply the Inject Response to Chromeleon:

• Digital inject response

If remote inputs provided by instruments such as the Dionex UVD 340U detector or the UCI Universal Chromatography Interface are available in the system, the Inject Response can be received via the remote input. Select Digital inject response when defining the device in the Inject response field. When installing the driver, assign the Inject Port for recording the injection signal in the device's Properties dialog box.

• Serial inject response

Instead of the remote input, you can use a serial connection to directly record the Inject Response. Then, however, the autosampler must send the corresponding string after the injection is complete. If it does, and if the command is listed in the instrument's manual, select Serial inject response in the Inject response field. Enter the appropriate format instruction in the Serial string field.

For an overview, refer to  The Generic Device Driver.