Teledyne 3000TA-EU - General purpose trace oxygen analyzer User Manual
Page 40
Installation 3000TA-
EU
Teledyne
Analytical
Instruments
28
terminal, or other digital device. It requires a standard 9-pin D
connector.
The output data 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 (HI, MED, LO)
The span of the range (0-100 ppm, 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.
Three input functions using RS-232 have been implemented to
date. They are described in Table 3-5.
Table 3-5: Commands via RS-232 Input
Command
Description
as
Immediately starts an autospan.
az
Immediately starts an autozero.
st
Toggling input. Stops/Starts any status
message output from the RS-232, until
st
The RS-232 protocol allows some flexibility in its implementation.
Table 3-6 lists certain RS-232 values that are required by the 3000TA
implementation.
Table 3-6: Required RS-232 Options
Parameter Setting
Baud
2400
Byte
8
bits
Parity
none
Stop
Bits
1
Message Interval
2 seconds. When CRC opens
again, zero and span are done,