Hanna Instruments HI 255 - Manual (Page 40)

40
• n=1 pH range/0.1 resolution
• n=2 mV range
• n=3 Relative mV range
• n=4 EC range
• n=5 TDS range
• n=6 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
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.
MDR Requests the instrument model name and firmware code.
PAR Requests the setup parameters setting.
NSL Requests the number of logged samples.
GLP Requests the calibration data record.
LOD xxx Requests the xxx th record logged data (“Err3” sent when “xxx” is
an invalid record number).
LOD ALL Requests all logged data.
Note: • “Err8” is sent if instrument is not in measurement mode.
• “Err7” is sent if mV are asked during pH calibration mode.
• “NAK” (21) character is sent when the instrument receives an
unknown or a corrupted command.
The characters sent by the instrument are always capital letters.