Table of Contents
Advertisement
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
MDR
not available
HOP
not available
STS
not available
ECR
not available
TMR
not available
CAR
not available
GET
CNN
PWD
C
C
C
C
1
2
3
4
56
Remarks
Requests the software code for model
identification (always available)
Requests hardware options
Requests the instrument status (relays, LEDs,
configuration change flag, etc.)
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)
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)
Requests last calibration data
(always available)
Requests setup item C.NN
(e.g. "r.01" ; always available)
Sends the general password (always available)
Command
Parameter
SET
CNNP
P
C
C
C
1
2
1
2
3
EVF
not available
EVN
not available
AER
not available
CLS
not available
CLP
not available
HLD
not available
KDS
not available
KCD
not available
KUP
not available
KRG
not available
KST
not available
KCL
not available
KDW
not available
KCF
not available
(*)
C
C
C
C
are ASCII chars corresponding to the setup item content; P
1
2
3
4
byte used
for sign as follows:
P
= + if>0
1
P
= -
if<0
1
When the sign is not used, set P
to "+".
1
P
is used with particular meaning for the following items:
2
G.01:
P
= 0 if range is 1999 μS/cm
2
P
= 1 if range is 19.99 mS/cm
2
P
= 2 if range is 199.9 mS/cm
2
G.02:
P
= 0 if range is 1000 ppm
2
P
= 1 if range is 10.00 ppt
2
P
= 2 if range is 100.0 ppt
2
P
= 3 if range is 1000 ppt
2
Remarks
C
Sets setup item C.NN (e.g. "r.01") with
4
parameter P
P
C
C
C
C
(*) (not available
1
2
1
2
3
4
if the controller is in setup mode)
Requests the event log file (not available if
the controller is in setup mode)
Requests new event log file (not available if
the controller is in setup mode)
Requests active errors (always available)
To start cleaning (for advanced cleaning;
always available)
To abort cleaning (always available)
To enter/exit the hold mode
(always available; password required)
Same as DIAG key (always available)
Same as CAL DATA key (always available)
Same as up arrow key (always available)
Same as right arrow key (always available)
Same as SETUP key (always available)
Same as CAL key (always available)
Same as down arrow key (always available)
Same as CFM key (always available)
is an additional
1
57
Advertisement
Table of Contents
