174
Agilent 7820 GC Service
proper base current is supplied.
An open-collector logic gate will perform this same function.
A low-side drive IC will also work, but Darlington-type drivers
should be avoided as they will not meet the low-side voltage
requirement of less than 0.4V.
The Remote Connector
Signal Descriptions
Prepare (Low True)—Request to prepare for analysis. Receiver
is any module performing pre-analysis activities. For example,
shorting pin 2 to ground will put the GC into “Prep-Run” state.
This is useful for Splitless Mode to prepare the inlet for injection
or when using “Gas Saver Mode.” This function is not needed by
Agilent autosampler systems.
Ready (High True)— If The Ready Line is high (> 2.2 VDC)
then the system is ready for next analysis. Receiver is any
sequence controller.
Start (Low True)—Request to start run/timetable. Receiver is any
module performing runtime-controlled activities.
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