Hanna Instruments HI 2400 - Manual (Page 25)

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CHR xx Change the instrument range according with the parameter
value (xx):
• xx=06 % range
• xx=07 ppm range
The instrument will answer for these commands with:
<STX> <answer > <ETX>
where: <STX> is 02 ASCII code character (start of text)
<ETX> is 03 ASCII code character (end of text)
<answer>:
<ACK> is 06 ASCII code character (recognized command)
<NAK> is 21 ASCII code character (unrecognized command)
<CAN> is 24 ASCII code character (corrupted command)
COMMANDS REQUIRING AN ANSWER
The instrument will answer for these commands with:
<STX> <answer> <checksum> <ETX>
where the checksum is the bytes sum of the answer string sent as 2 ASCII
characters.
All the answer messages are with ASCII characters.
RAS
Causes the instrument to send a complete set of readings.
The answer string contains:
• Meter mode (2 chars):
• 06 - % range
• 07 - ppm range
• Meter status (2 chars of status byte): represents a 8
bit hexadecimal encoding.
• 0x10 - temperature probe is connected
• 0x01 - new GLP data available
• 0x02 - new SETUP parameter
• Reading status (1 char): R - in range, O - over
range, U - under range.
• The reading (corresponding to the selected range) -
7 ASCII chars, including sign and decimal point.
• Temperature reading - 7 ASCII chars, with sign and
two decimal points, always in ºC.