MODEL 1000 SEP 2005
MAINTENANCE
5-51
5.11.1 Function Codes
If the Analyzer valves are not being activated during "Continuous Operation" or "Auto Sequence"
mode, it may be necessary to determine whether Function Code signals are being transmitted
correctly. This section provides a guide to the Function Codes.
The four Function Code signals form a binary number which, after interpretation by the Analyzer's
decoder board, determines the position of specific chromatograph valves. Chromatograph valve
positions are either SET (ON) or RESET (OFF).
Table 5-6 lists the voltage measurements that should occur at the Function Code terminals for
corresponding states of the chromatograph valves. A measurement of 5 (five) volts at any of the
function code terminals indicates a binary zero (0). A measurement of 0 (zero) volts indicates a
binary one (1).
For additional reference, Table 5-7 provides the Function Code dictionary in hexadecimal for
corresponding states of the chromatograph valves.
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