Hanna Instruments HI 720 Instruction Manual page 32

Conductivity process controller with inductive probe
Hide thumbs Also See for HI 720:
Table of Contents

Advertisement

Examples of answer to the ECR command are:
• NN<STX>02.16mSC<ETX>= 2.16 mS/cm, control is ON & alarm is OFF
• NN<STX>1886uSN<ETX>= 1886 μS/cm, control is OFF
• NN<STX>00.94pptA<ETX>= 0.94 ppt, control and alarm are ON
• NN<STX>>>>.>mSN<ETX>= overflow (range 199.9 mS/cm), control is OFF
The answer to the TMR command is:
"NN<STX><ascii string for a float>S<ETX>"
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:
• NN<STX>25.0C<ETX>= 25.0°C, control is ON & alarm is OFF
• NN<STX>-2.8N<ETX>= -2.8°C, control is OFF
The answer to the STS command is:
"NN<STX>C
C
C
C
<ETX>"
1
2
3
4
Where C
C
are the ASCII representation of byte B
1
2
0xF3, C
= "F", C
= "3"), C
C
1
2
3
scribed below (e.g. B
= 0x1D, C
2
3
The meaning of B
and B
is:
1
2
B
bit 0
alarm relay (1: energized, 0: de-energized)
2
B
bit 1,2
red LED (bit 2 = 0 and bit 1 = 0: LED is OFF;
2
bit 2 = 1 and bit 1 = 0: LED is fixed ON;
bit 2 = 1 and bit 1 = 1: LED blinks)
B
bit 3
relay 1 (1: energized, 0: de-energized)
2
B
bit 4
relay 2 (1: energized, 0: de-energized)
2
B
bit 5
relay 3 (1: energized, 0: de-energized)
2
B
bit 6
relay 4 (1: energized, 0: de-energized)
2
B
bit 7
hold digital output (1: energized, 0: de-energized)
2
B
bit 0
control (1: ON, 0: OFF)
1
B
bit 1,2
setup mode
1
(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
bit 3
calibration mode with device unlocked (1: yes, 0: no)
1
62
described below (e.g. B
1
are the ASCII representation of byte B
4
= "1", C
= "D").
4
B
bit 4
1
B
bit 5
1
B
bit 6
1
B
bit 7
1
The CAR request produces the following answer:
If conductivity has not been calibrated: "NN<STX>0<ETX>"
If calibration has been performed: "NN<STX>1$calib.performed$date$time
$calibration point$cell_constant or inst_factor$<ETX>"
The items in italic are separated by $ character and have the following formats:
• calib.performed
• date
=
• time
1
de-
• calibration point
2
• cell_constant or inst_factor
The event log file is requested through the EVF<CR> 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
"NN<STX>0<ETX>", otherwise:
"NN<STX>events_no\\event_code
$end_date
$end_time
1
$start_time
$end_date
2
$start_date
$start_time
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").
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)
calibration mode (set to 1 after a device power-up or
whatever complete calibration;
reset to 0 after receiving a CAR command)
hold mode (1: ON, 0: OFF)
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)
fix ASCII string
("Conductivity calibrated")
ddmmyy
("020404" for April 2, 2004)
hhmm
("1623" for 4:23 pm)
ASCII string (e.g. "with manual setting"
"on user point:2.00 uS"
"solution:0, 1413 uS")
ASCII string (e.g. "Cell constant:2.051"
"Inst. factor: 1.001")
$desA
$desB
$start_date
1
1
1
$desC
$desD
$\\event_code
$desA
1
1
1
2
$end_time
$desC
$desD
$\\...event_code
2
2
2
2
$end_date
$end_time
$desC
m
m
m
$start_time
1
1
$desB
$start_date
2
2
2
$desA
$desB
m
m
m
$desD
$\\<ETX>"
m
m
63

Advertisement

Table of Contents
loading

Table of Contents