Model 11-R
GRIMM AEROSOL TECHNIK GmbH & Co.KG Seite 58 von 83
5.1.5 RS-232 measurement transmission
There are three data strings for measurement transmission. The actual measurements as counts or
mass, the P-line with lead data and the K-line with calibration data.
The K-line appears once after ending the self-test at the start of every measurement and contains
information on the state of the laser diode and optical measuring cell. A detailed description is provided
in Section 7.5.
The P-line is identified with a “P” and contains the lead data, which correspond to the bytes saved in
data storage or sent over the interface. According to the configured interval, the P-line appears once or
e.g. after each dataset in what is known as fast P-mode. It is structured as follows:
P 14 9 23 12 56 1 0 0 100 25 64 4 0 0 0 6 217 375 36.2 33.6 N51.6279 E12.3962 H97
The data in the P-line are designated as follows:
Year Mon Day Hr Min Loc GF Err Qbatt Im UeL Ue4 Ue3 Ue2 Ue1 Iv P_Weight P_Vol{l} rH_i Temp_i GPS-Position
The meaning of the various values is explained in the following using sample values (in bold).
P 14 9 23 12 56 1 0 0 100 25 64 4 0 0 0 6 217 375 36.2 33.6 N51.6279 E12.3962 H97
The measuring time with year, month, day, hour and minute is stored in the first five places.
P 14 9 23 12 56 1 0 0 100 25 64 4 0 0 0 6 217 375 36.2 33.6 N51.6279 E12.3962 H97
This is followed by the measuring location, which can be chosen from 1 to 99, and the gravimetry factor.
For measurements in count mode, the gravimetry factor is not considered. The gravimetry factor can be
configured in mass mode. The factory default setting is 1.
P 14 9 23 12 56 1 0 0 100 25 64 4 0 0 0 6 217 375 36.2 33.6 N51.6279 E12.3962 H97
Error codes are stored in the eighth place. The error codes are encoded as bit values. For the meanings
of the error codes, see the table under control command E in Section 6.1.3. A value of 0 means there is
no error.
P 14 9 23 12 56 1 0 0 100 25 64 4 0 0 0 6 217 375 36.2 33.6 N51.6279 E12.3962 H97
The battery charge level is stored in the ninth place, followed by the motor current input of the internal
sample air pump. Both values are given in percent. A value of 130 for the battery charge level indicates
that the spectrometer is operated on the power supply. Typical values for the motor current input are
between 10 and 40%.
P 14 9 23 12 56 1 0 0 100 25 64 4 0 0 0 6 217 375 36.2 33.6 N51.6279 E12.3962 H97
The following five values contain a special storage location for low-value bits (UeL) and the bytes of a
maximum of four analogue voltage values for optional sensors and external sensors (Ue3, Ue2, Ue1),
e.g. for temperature, relative humidity and flow rate. 0 values indicate that no sensor is connected. The
resolution of the sensor voltage values is 10 bits, so that the bytes identified with Ue3 through Ue1 only
represent the higher value part. The two low-value bits for all 4 sensors are stored together in UeL. Bits
0 and 1 belong to Ue1, bits 2 and 3 to Ue2 etc. The maximum value of the analogue signal is 10 volts.
To obtain the voltage value in volts, the 10-bit value has to be multiplied by the factor 9.776E-3. Then
this voltage value is transformed into the measurement with the calibration data of the sensor. These
calibration data can be read from the device (control command {_}) and edited (control command {*}). A
user text (control command {$}) can also be set on the device for each sensor.
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