1215 External Connectors, 6890N
Remote start/stop
8 of 10
Jun 2001
Electrical
Agilent 6890 Gas Chromatograph Service Manual
Remote control
Remote control allows easy connection between single instruments or
systems to ensure coordinated analysis with simple coupling requirements.
Start Relay—A 120 millisecond contact closure
Figure 1215-7 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
Stop
H
H
H
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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