User Manual

spez1(INTERFACE; TYPE; START; VAR; DEFAULT)

• INTERFACE

• 1: RS232

• 2: RS485

• TYPE

• 1: constant length

• 2: variable length

• START: start position (starting with '0')

• VAR

• for TYPE = 1: value length

• for TYPE = 2: delimiter character (ASCII value)

• DEFAULT: on error this is value will be returned

In defining more than one arithmetic channel with this function

you can extract more than one value from one ASCII telegram.

To convert a variable value with start position 10, delimiter #,

interface RS485 and default value –1 from

“Value:_0023,6697#END” the call to spez1() should be

spez1(2; 2; 10; 35; -1) and the result is 3.6697.

With special function spez2() some special meteorological val-

ues can be calculated. The following functions are defined:

●spez2(air pressure; height; 1);

Calculates the air pressure on sea level out of air pressure at

given height.

●spez2(app_wind; fair_wind; wind_angle; 2);

Calculates the true wind speed out of apparent wind, fair wind

and the enclosed angle.

●spez2(temperature; radiance_balance; saturation_deficit ;

wind_speed; 3);

Calculates the evaporation acc. to Penman-Monteith.

Hardware Manual COMBILOG 1022