Hanna Instruments HI 504 User Manual
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Following are examples for setup item format:
• item C.32, maximum relay ON time
:
parameter value =
15, format =
“+015
◊◊
“, where
◊
indicates a blank;
• item C.21, setpoint 2 value while in ORP mode: parameter
value = -1200 mV, format = “-01200”;
• item G.01, temperature compensation: parameter value
= “AtC”, format = “+0*AtC”.
For all items with a fixed set of choices, blank spaces on the
left of the value displayed are replaced with “*” (as many “*”
characters are needed to reach the maximum string length,
which is for example 3 for item C.57).
Blanks must be put on the tail for all items in order to have
always a total length of 6 characters (see the setup table).
The same parameter format used for setup item setting is
used also for setup item getting (i.e. when a
“NNGETCNN
the reply “NN
1
P
2
C
1
C
2
C
3
C
4
To perform a “NNSETCNN...” command the general pass-
word has to be sent in advance through the “NNPWD...”
command. See above for the password effectiveness time-out.
Some special setup items can not be set through RS485 com-
mands. In particular it is not possible to access any setup
item that performs a test on the instrument and it is not pos-
sible to configure the hardware identifier (setup item G.12).
The “NNSET...” and “NNGET...” commands when used for
password items, baud rate, hardware identifier, F.00 and F.10
items, P.00 through P.09 items, are answered with
“NN
As soon as the process controller realizes that a command
has been received, it sends one of the following answers:
1) “NN”, ACK (char 0x06) if the process controller recog-
nizes the set command and performs the requested task;
2) “NN”, STX (char 0x02), DATA, ETX (char 0x03) if the re-
ceived command is a request of data;
3) “NN”, NAK (char 0x15) if the process controller does not
recognize the command or if the command syntax is wrong;
Command
Parameter
Remarks
NNEVN
not available
Requests new events
(always available)
NNAER
not available
Requests active errors
(always available)
NNCLS
not available
To start advanced cleaning
(always available)
NNCLP
not available
To abort cleaning
(always available)
NNHLD
not available
To enter/exit the hold mode
(always available; pwd required)
NNKDS
null
Same as
LCD
key
NNKCD
null
Same as
CAL DATA
key
NNKUP
null
Same as
æ
key
NNKRG
null
Same as key
NNKST
null
Same as
SETUP
key
NNKCL
null
Same as
CAL
key
NNKDW
null
Same as key
NNKCF
null
Same as
CFM
key
NNK 02
null
Same as
LCD+CAL+SETUP
keys
(*)
C
1
C
2
C
3
C
4
are ASCII chars corresponding to the setup item
content; P
1
P
2
are two additional bytes used for sign and half
digit as follows:
P
1
=
+
if>0
P
1
=
-
if<0
P
2
=
0
if most significant digit is not used
P
2
=
1
if most significant digit is used
When an item is shorter than 4 digits the C
i
characters are
filled with blanks.