Hanna Instruments HI 23 - Manual (Page 25)

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KDS null Same as LCD key
KDW null Same as key
KRG null Same as key
KST null Same as SETUP key
KUP null Same as key
MDR null Request firmware code
ECR null Request EC reading (available in control or
idle mode only)
TDR null Request TDS reading (available in control
or idle mode only, for HI 24 series only)
RNG null Request measure Range (available in
control or idle mode only)
TMR null Request temperature reading
PWD NNNN Send the 4-digit password
SET NNPC
1
C
2
C
3
C
4
C
5
Set setup item NN to the PC
1
C
2
C
3
C
4
C
5
value;
P=+ if the value is greater than 0, P=- if the value is less
than 0. C
1
can be 0 or 1; only C
2
C
3
C
4
C
5
can be 0 to 9 or blank
(the command is not available if the controller is in setup
mode)
Note If the controller is not in control or idle mode and the tem-
perature reading is requested through the TMR command,
the controller answers with the last acquired reading when
it was in control or idle mode.
Following are examples of commands for setup items:
“03SET22+01200”
This command sets the setup item 22 (relay 2 set point) of a
EC controller, identified by the process ID number 03, to the
+12.00 mS value.
• Using the arrow keys, set the
controller address. To exit setup,
press CFM key and then LCD key.
Note In an RS 485 network, each device must have a different
address.
• Select the desired baud rate with the up and down keys
and press the CFM key to store the new settings. Available
baud rates are: 1200, 2400, 4800 and 9600 Bps.
The PC software to communicate with the controllers is
HI92500. Please refer to this product specifications for fur-
ther informations.
RS485 PROTOCOL
The commands sent to the controller must have the follow-
ing format:
• 2-digit process ID number
• 3-character command name
• Parameters (variable length, may be null)
• End of command (always the CR character, Hex 0D)
A maximum time interval of 20 ms is allowed between two
consecutive characters of a command. It is possible to send
commands to change the controller settings or to simply
ask information on the controller status. Following is the
complete list of commands available:
Command Parameter Description
CAR null Request calibration data
GET NN Request setup item NN
K01 null Same as CFM+CAL keys
K02 null Same as LCD+CAL+SETUP keys
KCD null Same as CAL DATA key
KCF null Same as CFM key
KCL null Same as CAL key