36 7820A GC Installation Manual
7820A GC Installation Guide
APG Remote 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 the Gas Saver. 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.
The 7820A GC requires a pulse duration of at least 500
micro-seconds to sense a start from an external device.
Figure 13 APG Remote connector pin-out details
1
5
6
9
Pin Function Logic
1
2
3
4
5
6
7
8
9
Digital ground
Prepare
Start
Start relay
Start relay
not used
Ready
Stop
not used
LOW true
LOW true (input)
HIGH true (output)
LOW true
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