Hanna-instruments HI 720 Series Manual do Utilizador descarregar pdf (Página 29)

Command Parameter Remarks

SET CNNP

Sets setup item C.NN (e.g. “r.01”) with

parameter P

(*) (not available

if the controller is in setup mode)

EVF not available Requests the event log file (not available if

the controller is in setup mode)

EVN not available Requests new event log file (not available if

the controller is in setup mode)

AER not available Requests active errors (always available)

CLS not available To start cleaning (for advanced cleaning;

always available)

CLP not available To abort cleaning (always available)

HLD not available To enter/exit the hold mode

(always available; password required)

KDS not available Same as DIAG key (always available)

KCD not available Same as CAL DATA key (always available)

KUP not available Same as up arrow key (always available)

KRG not available Same as right arrow key (always available)

KST not available Same as SETUP key (always available)

KCL not available Same as CAL key (always available)

KDW not available Same as down arrow key (always available)

KCF not available Same as CFM key (always available)

(*) C

are ASCII chars corresponding to the setup item content; P

is an additional

byte used fo

r sign as follows:

= + if>0

= - if<0

When the sign is not used, set P

to “+”.

is used with particular meaning for the following items:

G.01: P

= 0 if range is 1999 μS/cm

= 1 if range is 19.99 mS/cm

= 2 if range is 199.9 mS/cm

G.02: P

= 0 if range is 1000 ppm

= 1 if range is 10.00 ppt

= 2 if range is 100.0 ppt

= 3 if range is 1000 ppt

RS485 Protocol for HI 720

Commands are composed of four parts: address, command identifier, param-

eter, end of command. The end of command corresponds to the CR char (0x0d).

Some commands are used when the master is requesting information from the

controller, others when the master wants to set a parameter in the process memory

(RAM or EEPROM).

The master software must send the command string with a maximum delay of

20 ms between each character.

If the general password has not been entered, the program on the master must

not allow setting commands other than keyboard or cleaning start/stop com-

mands. After the general password recognition through the “PWD” command,

a 1-minute time-out is let before the process meter locks again, i.e. if the PC

program waits for more than 1 minute between two subsequent commands, the

second one is not fulfilled and the “PWD” command must be issued again.

This is the complete list of available commands:

Command Parameter Remarks

MDR not available Requests the software code for model

identification (always available)

HOP not available Requests hardware options

STS not available Requests the instrument status (relays, LEDs,

configuration change flag, etc.)

ECR not available Requests last acquired conductivity, TDS or

concentration value (always available, but

the retrieved value is the last measurement

performed when the controller was in idle

or control mode)

TMR not available Requests last acquired temperature value

(always available, but the retrieved value is

the last measurement performed when the

controller was in idle or control mode)

CAR not available Requests last calibration data

(always available)

GET CNN Requests setup item C.NN

(e.g. “r.01” ; always available)

PWD C

Sends the general password (always available)

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