Hanna-instruments HI 504 Instrukcja Użytkownika Pobierz pdf (Strona 32)

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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<CR>” command is received from the PC,

the reply “NN<STX>P

<ETX>” 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 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<CAN>”.

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

EVN not available Requests new events

(always available)

AER not available Requests active errors

(always available)

CLS not available To start advanced cleaning

(always available)

CLP not available To abort cleaning

(always available)

HLD 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

are ASCII chars corresponding to the setup item

content; P

are two additional bytes used for sign and half

digit as follows:

= + if>0

= - if<0

= 0 if most significant digit is not used

= 1 if most significant digit is used

When an item is shorter than 4 digits the C

characters are

filled with blanks.

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 58 59

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