User Guide

44
The meaning of B
1
and B
2
is:
B
2
bit 0 green LED (1: ON; 0: OFF)
B
2
bit 1,2 red LED (bit 2 = 0 and bit 1 = 0: LED is OFF;
bit 2 = 1 and bit 1 = 0: LED is fixed
ON; bit 2 = 1 and bit 1 = 1: LED blinks)
B
2
bit 3 free for future use (and set to 0)
B
2
bit 4 free for future use (and set to 0)
B
2
bit 5 free for future use (and set to 0)
B
2
bit 6 free for future use (and set to 0)
B
2
bit 7 free for future use (and set to 0)
B
1
bit 0 free for future use (and set to 0)
B
1
bit 1,2 setup mode (bit 2=0 and bit 1=0: not in setup
mode; bit 2=1 and bit 1=0: setup mode, view
only; bit 2=1 and bit 1=1: setup mode, unlocked)
B
1
bit 3 calibration mode with device unlocked
(1: yes, 0: no)
B
1
bit 4 setup updated (set to 1 after a device power-up or
a device reset or a change in setup made through
the instrument keyboard; reset to 0 after receiving
a GET command)
B
1
bit 5 calibration made (set to 1 after a device power-up
or whatever complete calibration; reset to 0 after
receiving a CAR command)
B
1
bit 6 hold mode (1: ON, 0: OFF)
B
1
bit 7 free for future use (and set to 0)
The NNCAR request produces the following answer:
1) Instrument configured for pH:
If pH is not calibrated: “NN<STX>0<ETX>”
If calibration has been performed: “NN<STX>1 date time offset
slope1 slope2 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)
offset ASCII string for a float (example: “-0.2”)
slope1 ASCII string for a float (example: “62.5”)
slope2 ASCII string for a float (example: “60.4”)