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• 13 mV range on channel 1
• 14 Relative mV range on channel 1
• 15 ISE range on channel 1 (HI 3221)
• 20 ISE range on channel 2 (HI 3222)
• 21 mV range on channel 2 (HI 3222)
• 22 Relative mV range on channel 2 (HI 3222)
• 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
• 0x04 - out of calibration range
• 0x08 - the meter is in autoend point mode
• Reading status (2 chars): R - in range, O - over range, U -
under range. First character corresponds to the primary
reading. Second character corresponds to mV reading.
• Primary reading (corresponding to the selected range) -
11 ASCII chars, including sign and decimal point and
exponent.
• Secondary reading (only when primary reading is not
mV) - 7 ASCII chars, including sign and decimal point.
• Temperature reading - 8 ASCII chars, with sign and two
decimal points, always in ºC.
MDR Requests the instrument model name and firmware code (16 ASCII
chars).
GLPx Requests the calibration data record.
• x=1 calibration data from channel 1
• x=2 calibration data from channel 2 (HI 3222)
The answer string contains:
• GLP status (1 char): represents a 4 bit hexadecimal encoding.
• 0x01 - pH calibration available
• 0x02 - Rel mV calibration available
• 0x04 - ISE calibration available
• pH calibration data if x=1 (if available), which contains:
• the number of calibrated buffers (1 char)
• the ion charge, with sign (2 chars) (HI 3221)
• the offset, with sign and decimal point (7 chars)
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