Hanna Instruments HI 720 Series - Manual (Page 32)

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B
1
bit 4 setup updated (set to 1 after a device power-up, device
reset or a change in setup made through instrument
keyboard; reset to 0 after receiving a GET command)
B
1
bit 5 calibration mode (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 error indication for concentration table
(if G.00 = “Concentration”) or for user temperature
compensation table (if G.00 = “Conductivity” or “TDS”)
(1: there are some errors, 0: no error)
The CAR request produces the following answer:
If conductivity has not been calibrated: “NN0”
If calibration has been performed: “NN1$calib.performed$date$time
$calibration point$cell_constant or inst_factor$”
The items in italic are separated by $ character and have the following formats:
• calib.performed
fix ASCII string (“Conductivity calibrated”)
• date ddmmyy (“020404” for April 2, 2004)
• time hhmm (“1623” for 4:23 pm)
• calibration point ASCII string (e.g. “with manual setting”
“on user point:2.00 uS”
“solution:0, 1413 uS”)
• cell_constant or inst_factor
ASCII string (e.g. “Cell constant:2.051”
“Inst. factor: 1.001”)
The event log file is requested through the EVF command. The total length
of the event log file is 100 records. Here is the answer format:
If there is no generated error or event, the answer has the format
“NN0”, otherwise:
“NNevents_no\\event_code
1
$desA
1
$desB
1
$start_date
1
$start_time
1
$end_date
1
$end_time
1
$desC
1
$desD
1
$\\event_code
2
$desA
2
$desB
2
$start_date
2
$start_time
2
$end_date
2
$end_time
2
$desC
2
$desD
2
$\\...event_code
m
$desA
m
$desB
m
$start_date
m
$start_time
m
$end_date
m
$end_time
m
$desC
m
$desD
m
$\\”
where m is the number of events.
Each token is followed by a $ character.
“events_no” is the number of events and its format is the ASCII format for a
number (“1”, “2”.... “99”, “100”).
Examples of answer to the ECR command are:
• NN02.16mSC= 2.16 mS/cm, control is ON & alarm is OFF
• NN1886uSN= 1886 μS/cm, control is OFF
• NN00.94pptA= 0.94 ppt, control and alarm are ON
• NN>>>.>mSN= overflow (range 199.9 mS/cm), control is OFF
The answer to the TMR command is:
“NNS”
where “S” means “status” and can be equal to:
• “A”, i.e. control and alarm are ON
• “C”, i.e. control is ON and alarm is OFF
• “N”, i.e. control is OFF
Examples of answer to the TMR command are:
• NN25.0C= 25.0°C, control is ON & alarm is OFF
• NN-2.8N= -2.8°C, control is OFF
The answer to the STS command is:
“NNC
1
C
2
C
3
C
4
”
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
de-
scribed below (e.g. B
2
= 0x1D, C
3
= “1”, C
4
= “D”).
The meaning of B
1
and B
2
is:
B
2
bit 0 alarm relay (1: energized, 0: de-energized)
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 relay 1 (1: energized, 0: de-energized)
B
2
bit 4 relay 2 (1: energized, 0: de-energized)
B
2
bit 5 relay 3 (1: energized, 0: de-energized)
B
2
bit 6 relay 4 (1: energized, 0: de-energized)
B
2
bit 7 hold digital output (1: energized, 0: de-energized)
B
1
bit 0 control (1: ON, 0: OFF)
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)