AMA Instruments The GC 5000 BTX, Operating Manual, Page: 149 / 152

Operating Manual GC 5000 BTX; Version 5 – 11/2010 147
17.8 Appendix
Protocol bytes of the AMA Instruments GC5000BTX
The following charts show the configuration of the data bytes which can be
sent from the AMA GC 5000 BTX Analyzer via the “Gesytec-II” protocol.
Control byte
Bit 0 Start sampling
Bit 1 Zero gas on (calibration gas 1)
Bit 2 Span gas on (calibration gas 2)
Bit 3 Not used
Bit 4 Not used
Bit 5 Not used
Bit 6 Not used
Bit 7 Not used
(Start of zero gas run needs bit 0 and bit 1 set, start of span gas run bit 0
and bit 2.)
Status byte
Bit 0 System off
Bit 1 Maintenance / Stand alone mode
Bit 2 Zero gas running (calibration gas
1)
Bit 3 Span gas running (calibration gas
2)
Bit 4 Program step sampling running
Bit 5 New results
Bit 6 Not used
Bit 7 Not ready
Error byte
Bit 0 Pre-cooling alarm enrichment tube
Bit 1 Sample alarm
Bit 2 Carrier gas alarm
Bit 3 Ignition of FID not possible
Bit 4 FID too cold
Bit 5 FID too cold for 8 minutes
Bit 6 Not used
Bit 7 Communication breakdown to
MFC / Temp. controller
Status and error byte show the current state of the analyzer.
Note: While transmitting results, these status and error bytes indicate
the analyzer status during data acquisition only.