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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
according to the current range:
• pH, temperature and mV reading on pH range.
• mV and temperature reading on mV range
The answer string contains:
• Meter mode (2 chars):
• 00 ‑ pH value (0.001 resolution)
• 01 ‑ pH range (0.01 resolution)
• 03 ‑ mV range
• Meter status (2 chars of status byte): represents an
8 bit hexadecimal encoding.
• 0x10 ‑ temperature probe is connected
• 0x01 ‑ new GLP data available
• 0x02 ‑ new SETUP parameter
• Reading status (2 chars): R ‑ in range, O ‑ over range,
U ‑ under range. First character corresponds to the
pH range reading. (Not for Hanna Instruments ORP
electrodes with pin.) Second character corresponds
to mV reading.
• pH reading on pH range only ‑ 7 ASCII chars,
including sign and decimal point. (Not for
Hanna Instruments ORP electrodes with pin.)
• mV reading ‑ 7 ASCII chars, including sign and
decimal point.
• Temperature reading ‑ 8 ASCII chars, with sign and
two decimal points, always in ºC.