Teledyne 2010B - Split architecture thermal conductivity analyzer - Manual (Page 31)

Teledyne Analytical Instruments
Thermal Conductivity Analyzer Part I: Control Unit
Part I 3-9
3.3.8 RS-232 Port
The digital signal output is a standard RS-232 serial communications
port used to connect the analyzer to a computer, terminal, or other digital
device. It requires a standard 9-pin D connector.
Output: The data output is status information, in digital form, updated
every two seconds. Status is reported in the following order:
• The concentration in ppm or percent
• The range in use (01 = Range 1, 02 = Range 2, 03 = Range 3,
CAL = Range 4)
• The scale of the range (0-100 %, etc)
• Which alarms—if any—are disabled (AL–x DISABLED)
• Which alarms—if any—are tripped (AL–x ON).
Each status output is followed by a carriage return and line feed.
Input: The input functions using RS-232 that have been implemented
to date are described in Table 3-3.
Table 3-3: Commands via RS-232 Input
Command Description
as Immediately starts an autospan.
az Immediately starts an autozero.
rp Allows reprogramming of the
APPLICATION (gas use)
and
ALGORITHM (linearization)
System functions.
st Toggling input. Stops/Starts any status message output from
the RS-232, until st is sent again.
rm1 Range manual 1
rm2 Range manual 2
rm3 Range manual 3
rm4 Range manual CAL
ra Range auto
Implementation: The RS-232 protocol allows some flexibility in its
implementation. Table 3-4 lists certain RS-232 values that are required by
the Model 2010B implementation.