Hanna Instruments HI 3221 - Page 50

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CHRxx Change the instrument range according with the parameter
value (xx):
• xx=10 pH range/0.001 resolution on channel 1
• xx=11 pH range/0.01 resolution on channel 1
• xx=12 pH range/0.1 resolution on channel 1
• xx=13 mV range on channel 1
• xx=14 Relative mV range on channel 1
• xx=15 ISE range on channel 1 (HI 3221)
• xx=20 ISE range on channel 2 (HI 3222)
• xx=21 mV range on channel 2 (HI 3222)
• xx=22 Relative mV range on channel 2 (HI 3222)
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 in
according with the current range:
• pH, temperature and mV reading on pH range.
• Rel mV, absolute mV and temperature reading on Rel
mV range.
• concentration, mV and temperature reading on ppm
range (HI 3221, HI 3222).
The answer string contains:
• Meter mode (2 chars):
• 10 pH range/0.001 resolution on channel 1
• 11 pH range/0.01 resolution on channel 1
• 12 pH range/0.1 resolution on channel 1