Hanna Instruments HI 504910 - Manual (Page 22)

42 43
(*) 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.
Following are examples for setup item format:
• item I.12, minimum pH probe slope : parameter value =
56.2 mV, format = “+0562 ◊◊ “, where ◊ indicates a blank;
• item F.11, temperature reading offset adjustment: param-
eter value = -0.3°C, format = “-00003”;
• 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 I.11).
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” command is received from the PC,
the reply “NNP
1
P
2
C
1
C
2
C
3
C
4
” is sent back).
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 baud rate (setup item O.30).
Following is the complete list of commands available:
Command Parameter Remarks
NNMDR not available Requests firmware code
(always available)
NNSTS not available Requests instrument status
(LEDs, configuration change flag, etc.)
NNPHR not available Requests last pH reading
(instrument configured for pH)
NNMVR not available Requests last mV reading
(always available)
NNTMR not available Requests temperature reading
(always available)
NNCAR not available Requests all last calibration data
(always available)
NNGET CNN Requests setup item C.NN
NNPWD C
1
C
2
C
3
C
4
Sends the general password
(always available)
NNSET CNNP
1
P
2
C
1
C
2
C
3
C
4
Sets setup item C.NN with
parameter P
1
P
2
C
1
C
2
C
3
C
4
(*)
(not available in setup mode)
NNEVF not available Requests event log file
(always available)
NNEVN not available Requests new events
(always available)
NNAER not available Requests active errors
(always available)
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