Hanna Instruments HI 253 - Manual (Page 30)

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CHR n Change the instrument range according with the parameter
value (n):
• n=0 pH range/0.001 resolution
• n=1 pH range/0.01 resolution
• n=2 pH range/0.1 resolution
• n=3 mV range
• n=4 Relative mV range
• n=5 Ion range
COMMANDS REQUIRING AN ANSWER
pH? Causes the instrument to send the pH reading. If the range is set
to mV, “Err6” is received.
MV? Causes the instrument to send the mV reading. If the range is set
to pH, “Err6” is received.
MR? Causes the instrument to send the relative mV reading. If the
range is set to pH or mV, “Err6” is received.
TM? Causes the instrument to send the temperature reading.
pM? Causes the instrument to send the Ion reading. “Err6” is received
if the instrument is not in Ion range.
RAS Causes the instrument to send a complete set of readings in
according with the current range:
• pH, mV and temperature reading on pH range.
• mV and temperature reading on mV range.
• Rel mV, absolute mV and temperature reading on Rel
mV range.
• ppm, mV and temperature reading on Ion range.
MDR Requests the instrument model name and firmware code.
PAR Requests the setup parameters setting (instrument ID, calibra-
tion alarm time-out, pH range, beep status).
NSL Requests the number of logged samples.
GLP Requests the calibration data record.
LOD xxx Requests the xxx th record logged data (“Err3” is sent when “xxx”
is an invalid record number).
LOD ALL Requests all logged data.
Note: • “Err8” is sent if instrument is not in measurement mode.
• “Err7” is sent if mV are asked during pH calibration mode.
• “NAK” (21) character is sent when the instrument receives an
unknown or a corrupted command.