Hanna Instruments HI 3512 - Manual (Page 64)

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• The unit of the second reading (1 char) (it is sent
only for Resistivity, TDS and Salinity ranges only). It
represents the unit of the EC reading (0 - microsiemens,
1 - milisiemens)
• Secondary reading (only when primary reading is
not mV or EC) - 8 ASCII chars, including sign and
decimal point.
• Temperature reading - 7 ASCII chars, with sign and
decimal point, 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
The answer string contains:
• GLP status (1 char): represents a 4 bit hexadecimal
encoding.
• 0x01 - pH calibration available (Ch1) or EC
calibration available (Ch2)
• 0x02 - Rel mV calibration available (Ch1) or
Salinity calibration available (Ch2)
• 0x04 - ISE calibration available
Channel 1 GLP
• pH calibration data (if available), which contains:
• the number of calibrated buffers (1 char)
• the offset, with sign and decimal point (7 chars)
• the average of slopes, with sign and decimal
point (7 chars)
• the calibration time, yymmddhhmmss (12 chars)
• buffers information (for each buffer)
• type (1 char): 0 - standard, 1 - custom
• status (1 char): N (new) - calibrated in last
calibration; O (old) - from an old calibration.
• warnings during calibration (2 chars): 00 -
no warning, 04 - Clean Electrode warning
• buffer value, with sign and decimal point and
exponent (12 chars)
• the calibration time of the buffer, yymmdd
hhmmss (12 chars).