1210 External Connectors, 6890A and 6890 Plus
APG remote start/stop
6 of 14
Jun 2001
Electrical
Agilent 6890 Gas Chromatograph Service Manual
Figure 1210-3 Remote control analysis.
Control of analysis is maintained by signal readiness READY for next analysis,
followed by START of run and optional STOP of run triggered on the respective
lines. In addition, PREPARE and START REQUEST may be issued.
The signal levels are defined as standard TTL levels (0 V is logic true, +5 V is
logic false).
Input Load >= 2.2 kOhm against +5 V
Output type is open collector.
Prepare
Start Request
Start
Stop
Shutdown
Ready
H
H
H
H
H
L
Waiting for Ready
System Ready
Request for Prepare
Not Ready during Prep
System Ready
Start Requested
Inj cycle started
Injection / Start
Run
Runtime elapsed / Start
Postrun
Waiting for Ready
System Ready
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