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CHR xx Change the instrument range according to 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: <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 hexadecimal encoding
• 0x10: temperature probe connection
• 0x20: DO measure unit (0 = %, 1= mg/L)
• 0x01: new GLP data available
• 0x02: new setup parameter
PC INTERFACE
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