Hanna Instruments HI 2222 - Manual (Page 28)

28
The instrument will answer for these commands with:
>
where: is 02 ASCII code character (start of text)
is 03 ASCII code character (end of text)
:
is 06 ASCII code character (recognized command)
is 21 ASCII code character (unrecognized command)
is 24 ASCII code character (corrupted command)
COMMANDS REQUIRING AN ANSWER
The instrument will answer for these commands with:
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 in
according with 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):
• 01 - pH range (0.01 resolution)
• 03 - mV 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 (2 chars): R - in range, O - over
range, U - under range. First character corresponds to
the pH range reading. Not for HANNA 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
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.