Hanna Instruments HI 254 User Manual
Page 26
26
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
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.
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.
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.