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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:
<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:
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
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