80 Agilent 7890B Installation
B Cabling Diagrams and Remote Start/Stop
Start (Low True) Request to start run/timetable. Receiver is
any module performing runtime-controlled activities. The 7890
Series GC requires a pulse duration of at least
500 micro-seconds to sense a start from an external device.
Start Relay (Contact Closure) A 120 millisecond contact closure
used as an isolated output to start another device that is not
compatible or connected with APG Remote pin 3.
Stop (Low True) Request to reach system ready state as soon as
possible (for example, stop run, abort or finish, and stop
injection). Receiver is any module performing
runtime-controlled activities. Normally this line is not
connected, if the GC oven program is used to control the
method Stop time.
APG Remote timing diagram
Prepare H
Start H
Stop H
Ready L
Waiting for Ready
System Ready
Requeswt for Prepare
System Ready
Not Ready during Prep
Start Requested
Inject cycle started
Injection/Start
Run
Runtime elapsed/Start
Postrun
Waiting for Ready
System Ready
L
L
L
HHH
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