Hanna Instruments HI 23 Series Instruction Manual page 51

The time-out for the first character of the controller answer is
100 milliseconds.
The minim delay between the last received character and first
character of the answer is 15 ms.
When the controller answers to the ECR, TDR and TMR com-
mands, the reading is sent as ASCII string followed by a
character indicating the control and alarm status of the
controller and info for controller setup modified.
This character can assume the following values:
• " " " " " A A A A A " " " " " control and alarm are ON;
• "B "B "B "B "B" " " " " control and alarm are ON and need update controller setup
(GET commands);
• "C "C "C "C" " " " " control is ON and alarm is OFF; "C
• "D "D "D "D "D" " " " " control is ON and alarm is OFF and need update control-
ler setup (GET commands);
• "N" "N" "N" "N" "N" control and alarm are OFF;
"M" "M"
• "M" "M" "M" control and alarm are OFF and need update controller
setup (GET commands);
For example, a possible answer to the TMR command is:
"03<STX>10.7C<ETX>" "03<STX>10.7C<ETX>" "03<STX>10.7C<ETX>" "03<STX>10.7C<ETX>" "03<STX>10.7C<ETX>"
meaning that the current temperature reading is 10.7°C,
the control action is active and no alarm condition is present
and controller setup is updated on PC.
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