Hanna Instruments HI 98186 - Manual (Page 55)

55
CHR xx Change the instrument range according with the parameter
value (xx):
• xx=20 DO range
• xx=21 BOD range
• xx=22 OUR range
• xx=23 SOUR range
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:
• DO, temperature, and pressure on the DO and BOD range
• DO, temperature, pressure, OUR/SOUR value, OUR/SOUR test time
on the OUR/SOUR range
• BOD result, start DO value and end DO value when in the BO result
screen (meter mode 25)
The answer string contains:
• Meter mode (2 chars):
- 20 - DO range
- 21 - BOD range
- 22 - OUR range
- 23 - SOUR range
- 25 - BOD result screen
• Meter status (2 chars of status byte): represents a 8 bit hexadeci-
mal encoding