OZONE ANALYZER BMT 964 Manual, Rev. 04/2021
21
Normalizing Temperature 273.15 K
Normalizing Pressure 1.01325 bar
Molecular weight of carrier gas Oxygen
Date Format dd.mm.yy
RS-232 user output Timed
RS-2323 user output interval 1 s
User Baud Rate 9600 Baud
Alarm Beep On
Alarm Relais closing Yes
7 The Serial Interface
The BMT 964 has a bidirectional serial interface. In principle there are two different operating
modes: User-Mode and Link-Mode.
In User-Mode all relevant measurement data and status information are sent out in one single
line. As inputs only polling of this single line and zeroing are available.
In the more complex Link-Mode it is possible to view and change many parameters interactively.
Data transmission on the serial interface are always ended with a Carriage Return (CR, dec. 13).
User-Mode
If Timed/Polled is set to Timed, there is an output every Time Interval seconds (s. configura-
tion of the RS-232 on p. 19). In case Polled is set, the BMT 964 expects the input of a question-
mark ('?', without CR), to which it responds with a block of data. User mode data output always
follows the format in the following example:
26.03.01,12:16:28,154.3 g/Nm3,1.008 bar,00.0,0000
Data are separated by commas. Contents of a data block:
Date (format as set in Date Format)
Time as hh:mm:ss
Ozone concentration including unit, depending on the setting of Units-Ozone (position of
decimal point depends on range). During warmup the range is put out here (max. ozone
concentration)
Pressure inside the cuvette incl. unit, depending on Units-Pressure
Dirtyness of the cuvette in percent (during zeroing this is filled with AAAA)
16-Bit status information coded hexadecimally
The 16 bits of the status info have the following meaning:
Bit Meaning
0 (LSB) Lamp Low Warning
1 Lamp Low Error
2 Lamp Off Error
3 Dirty Warning
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