Hanna Instruments HI 3220 - Manual (Page 50)

50
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:
>
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.
• 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