User Guide

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Note The controller answers to the GET command with the same
data format explained in the SET command.
Following are examples of answers:
1) “03<STX> - 01200<ETX>”
The controller with process ID number 03 says that its
current setpoint is -1200mV.
2) “01<STX>UP50232320<ETX>”
The controller with process ID number 01 says that it is a
pH502323 model with firmware release 2.0.
The time-out for the first character of the controller answer is
2 seconds (except answers to PHR, MVR and TMR as ex-
plained below).
The minum delay between the last received character and
first character of the answer is 15 ms.
The time-out for the complete controller answer to the PHR,
MVR and TMR commands is:
30 ms at 9600 bps
40 ms at 4800 bps
60 ms at 2400 bps
90 ms at 1200 bps
When the controller answers to the PHR, MVR and TMR com-
mands, the reading is sent as ASCII string followed by a
character indicating the control and alarm status of the con-
troller. This character can assume the following values:
• “A”, control and alarm are ON;
• “C”, control is ON and alarm is OFF;
• “N”, control and alarm are OFF;
For example, a possible answer to the TMR command is:
“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.