User Guide

45
buf1 ASCII string for a float (example: “7.01”)
buf2 ASCII string for a float (example: “4.01”)
When some of the above items is missing (for example buf3 when
a 2-point calibration is performed) it is indicated with a “N” letter.
2) Instrument configured for ORP:
If mV is not calibrated: “NN<STX>0<ETX>”
If calibration has been performed: “NN<STX>1 date time N N N
buf1 buf2 N<ETX>”
The items in italic are separated by blank spaces and have the
following formats:
date ddmmyy (“020498” for April 2, 1998)
time hhmm (“1623” for 4:23 pm)
buf1 ASCII string for a float (example: “0”)
buf2 ASCII string for a float (example: “1900”)
None of the items above can be missing when the Instrument is
configured to measure and control ORP (as it always has to be
calibrated on two points).
The answer to the NNAER command is:
“NN<STX>C
1
C
2
C
3
C
4
C
5
C
6
<ETX>”
where C
1
C
2
are the ASCII representation of byte B
1
described
below (e.g. B
1
= 0xF3  C
1
= “F”, C
2
= “3”), C
3
C
4
are the
ASCII representation of byte B
2
described below (e.g. B
2
= 0x1D
 C
3
= “1”, C
4
= “D”), C
5
C
6
are the ASCII representation of
byte B
3
described below (e.g. B
3
= 0xBE  C
5
= “B”, C
6
=
“E”).
The meaning of B
1
, B
2
, B
3
is:
B
3
bit 0 free for future use (and set to 0)
B
3
bit 1 free for future use (and set to 0)
B
3
bit 2 free for future use (and set to 0)
B
3
bit 3 Life check error
B
3
bit 4 pH electrode broken or leakage
B
3
bit 5 Reference electrode broken or leakage
B
3
bit 6 Old pH probe
B
3
bit 7 Dead pH probe
B
2
bit 0 No calibration
B
2
bit 1 Temperature probe broken
B
2
bit 2 free for future use (and set to 0)