Vaisala Hydromet Data Collection Platform - Manual (Page 173)

Chapter 4 ________________________________________________ Configuring Telemetry Options
VAISALA______________________________________________________________________ 171
An air temperature of -2.6 °C will then be compressed as follows:
1. The value is first multiplied with the pre-conversion scale (10),
resulting in -26 to be compressed. The value is converted into the
12-bit binary 2's complement value 111111100110.
2. The binary value is then divided into two 6-bit parts and
compressed into ASCII-coded characters as follows:
a. The 6 least significant bits: 100110 -> 01100110 = 102 = 'f'
b. The remaining bits: 111111 -> 00111111 = 63 = '?'
3. The string of characters representing the compressed data value
- 2.6 is finally written as "?f".
The string 'DK' representing the air temperature would be
decompressed as follows:
1. The 6-bit parts of both characters are first extracted:
a. 'D' = 68 = 01000100 -> 000100
b. 'K' = 75 = 01001011 -> 001011
2. The resulting binary number is 000100001011, which is +267 in
the decimal format.
3. The decimal number is divided with the pre-conversion scale (10)
resulting +26.7 °C as the measured air temperature value.
Linking Report to Communication Port
Proceed to the Communications view and link the report to the
communication port to which the satellite transmitter is connected.
Timers Setup for Primary Transmissions
The timing of events must be set according to the transmission time and
interval. The setup of the timers is done in the Timers view of Lizard
Setup Software.
Data is read from a log file and the data string to be sent is composed at
the occurrence of the Create log report event of the HistServer_Lx
target. The transmission is scheduled at the Create report event of the
primary transmission report. These events must be set to occur at the
scheduled transmission interval and in advance of the actual
transmission, for example, one minute before the start of the