Agilent 7890 GC: Instrument SynchronizationInstalling and Controlling Third-Party Devices
Agilent 7890 GC: Instrument Synchronization
When operating the Agilent 7890 GC with an external autosampler, such as the G1888 Headspace Sampler, you need to synchronize the GC with the autosampler.
Synchronization can either be performed
via Chromeleon (for details, refer to 
G1888 Network Headspace Sampler: Instrument Synchronization)
–OR–
via a Remote Start/Stop cable (recommended). In remote inject synchronization, the injection is started by the sampler after receiving the Ready signal from the GC.
Synchronization via Remote Start/Stop Cable
A Remote Start/Stop cable is required to connect the GC with the autosampler thus allowing synchronization. When using a G1888 Headspace sampler, the Remote cable is provided by Agilent.
To synchronize the 7890 GC with a G1888 Headspace Sampler
Plug one end of the Remote cable into the Remote connector on the back panel of the GC. Connect the other end of the cable to the Remote port of the Headspace Sampler.
On the Server Configuration page of the G1888 headspace sampler, set GC Handshake to WAIT_H. This enables communication with the GC ('handshake') and the headspace sampler waits for the GC's Ready signal.
To synchronize the 7890GC with a non-Agilent autosampler
Observe the following points, when operating a non-Agilent autosampler with the 7890 GC:
The autosampler must be equipped with a Remote port to allow connection to the APG Remote connector of the GC.
The pin assignment of the Remote port of the autosampler must correspond to the pin assignment of the APG Remote connector of the GC (Start signal = pin 3, Ready signal = pin 7; also see pin and signal assignment of the APG Remote connector below).
|
|
Pin |
Signal |
Logic |
|
1 |
digital ground |
|
|
|
2 |
Prepare |
LOW true |
|
|
3 |
Start |
LOW true (input) |
|
|
4 |
Start relay |
|
|
|
5 |
Start relay |
|
|
|
6 |
not used |
|
|
|
7 |
Ready |
HIGH true (output) |
|
|
8 |
Stop |
LOW true |
|
|
9 |
not used |
|
Tip:
When performing synchronization via a Remote cable, the Start signal of the external autosampler may interfere with the start of the retention time in Chromeleon. To ensure that the GC is started only after receiving the Start signal from the autosampler, set the property UseSoftwareStart to False.
Troubleshooting
If you have special questions, please contact Dionex Service.
Further Information
For installation details for the GC, refer to Agilent 7890 GC: Installation
For installation details for the G1888 Headspace Sampler, refer to Agilent G1888 Network Headspace Sampler: Installation.
Also, refer to the operating instructions of the GC 7890 or G1888 Network Headspace Sampler.
