40
n=1 pH range/0.1 resolution
n=2 mV range
n=3 Relative mV range
n=4 EC range
n=5 TDS range
n=6 NaCl range
The instrument sends the ACK (6) character every time a command is
recognized and a NAK (21) character for invalid commands.
COMMANDS REQUIRING AN ANSWER
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.
Conductivity and temperature reading on EC range.
TDS and temperature reading on TDS range.
NaCl and temperature reading on NaCl range.
MDR Requests the instrument model name and firmware code.
PAR Requests the setup parameters setting.
NSL Requests the number of logged samples.
GLP Requests the calibration data record.
LOD xxx Requests the xxx
th
record logged data (Err3 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.
The characters sent by the instrument are always capital letters.
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