Appendix B. EC9800 Protocol
The Serinus implements a subset of the 9800 instrument protocol. Only the basic commands of reading
the concentration value and setting the instrument calibration state (measure, span or zero) are
supported.
B.1 Command Format
All commands are sent as ASCII strings. Fields are delimited by commas and the command ends with
the normal return key (i.e. the TERMINATOR is either a <CR> or a <LF>). The DEVICE I.D. is the Serial ID
assigned in the Main Menu → Communications Menu → Serial Communication Menu. If the
instrument is not being used in a multi-drop connection, the DEVICE I.D> can be replaced with the
string “???”.
B.2 Commands
DCONC
Function: Sends the current instantaneous concentration data to the serial port.
Format: DCONC, {<DEVICE I.D.>} {TERMINATOR}
Device response: {GAS} <SPACE> {STATUS WORD} <CR><LF>
The GAS value is the concentration value in the current instrument units, expressed as a floating point
number (i.e. 12.345). The STATUS WORD indicates the instrument status in hex (i.e. A01F) using the
following format:
Bit 15 = SYSFAIL (MSB)
Bit 14 = FLOWFAIL
Bit 13 = LAMPFAIL
Bit 12 = CHOPFAIL
Bit 11 = CVFAIL
Bit 10 = COOLERFAIL
Bit 9 = HEATERFAIL
Bit 8 = REFFAIL
Bit 7 = PS-FAIL
Bit 6 = HV-FAIL
Bit 5 = OUT OF SERVICE
Bit 4 = Instrument is in zero mode
Bit 3 = Instrument is in span mode
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