Hanna Instruments HI 2550 - Manual (Page 46)

46
CHRxx Change the instrument range according with the parameter
value (xx):
• xx=00 pH range/0.001 resolution
• xx=01 pH range/0.01 resolution
• xx=02 pH range/0.1 resolution
• xx=03 mV range
• xx=04 Relative mV range
• xx=06 EC range
• xx=07 TDS range
• xx=08 NaCl range
The instrument sends the “ACK” (6) character every time a command is
recognized and a “NAK” (21) character for invalid commands.
COMMANDS REQUIRING AN ANSWER
COMMANDS REQUIRING AN ANSWER COMMANDS REQUIRING AN ANSWER COMMANDS REQUIRING AN ANSWER COMMANDS REQUIRING AN ANSWER
RAS
Causes the instrument to send a complete set of readings in
according with the current range:
• pH, mV and temperature reading on pH range.
• mV and temperature reading on mV range.
• Rel mV, absolute mV and temperature reading on
Rel mV range.
• Conductivity and temperature reading on EC range.
• TDS and temperature reading on TDS range.
• NaCl and temperature reading on NaCl range.
The answer string contains:
• Meter mode (2 chars):
• 00 - pH range (0.001 resolution)
• 01 - pH range (0.01 resolution)
• 02 - pH range (0.1 resolution)
• 03 - mV range
• 04 - Rel mV range
• 06 - EC range
• 07 - TDS range
• 08 - NaCl range
• Meter status (2 chars of status byte): represents a 8
bit hexadecimal encoding.
• 0x10 - temperature probe is connected
• 0x01 - new GLP data available
• 0x02 - new SETUP parameter