ROTRONIC MBW 373 - Manual (Page 39)

35
Leading and Trailing Spaces
The 373 ignores leading and trailing spaces. It also ignores spaces before and after equal
signs and question marks. For example, each of the following commands is perfectly valid.
Dp? C
R
Dp ? C
R
Pump.on=1 C
R
Pump.on = 1 C
R
However, the following commands are invalid since spaces are embedded within the
keywords.
D p? C
R
Pu mp.on=1 C
R
Case Sensitivity
All commands are insensitive to case. In other words, it does not matter if the command is
sent in upper case letters, lower case letters, or as some combination of the two. For
example, the commands DP?, Dp?, dP?, and dp? are identical to the 373 and will return the
measured dew point value.
Numeric Values
All numeric data sent to or received from the 373 is done so in either standard or scientific
notation. Sending a number as 12.34 is the same as sending it as 1234e-2 or as 1.234e1.
Depending on the value of numeric responses the 373 sends out, it may send the numbers in
either standard or scientific notation.
Numeric data is never appended with text of any kind. In other words, if requesting a
temperature related value, only the numeric portion of the value is sent. The units are
assumed but never sent.
The following table lists the units that numeric data adheres to, regardless of the units
selection on the touch screen display or set via the RS-232. In other words, when you
change units (even if you changed them via RS-232), you affect only what is seen on the
display. All numeric values retrieved from the RS-232 will always be in the following units.
Also, when sending data of any kind, do so in these same units.
Parameter Units via RS-232
Temperature °C
Pressure Pa
Flow l/m
RH %
Absolute Humidity
g/m
3
Specific Humidity g/kg
Volume Ratio PPMv
Weight Ratio PPMw
PRT Resistance Ohms
Some values simply require integer numbers such as 1 and 0 for On and Off, while others
might need real numbers with a decimal point. The 373 recognizes both types of numbers
and will attempt to convert the values you send to the correct format. For example, the
number 0 means Off, while 1 or any other real or integer value means On.