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Communications Setup and Operation Teledyne API - T100 UV Fluorescence SO2 Analyzer
150
6.6.2.4. SETTING THE HESSEN PROTOCOL RESPONSE MODE
Teledyne API’s implementation of Hessen Protocol allows the user to choose one of
several different modes of response for the analyzer.
Table 6-6: T100 Hessen Protocol Response Modes
MODE ID MODE DESCRIPTION
CMD
This is the Default Setting. Reponses from the instrument are encoded as the traditional command format.
Style and format of responses depend on exact coding of the initiating command.
BCC
Responses from the instrument are always delimited with <STX> (at the beginning of the response, <ETX>
(at the end of the response followed by a 2 digit Block Check Code (checksum), regardless of the command
encoding.
TEXT
Responses from the instrument are always delimited with <CR> at the beginning and the end of the string,
regardless of the command encoding.
To Select a Hessen response mode, access the COMMUNICATIONS Menu (refer to
Figure 5-13), then press:
SETUP X.X HESSEN RESPONSE MODE :CMD
<SET SET> EDIT EXIT
SETUP X.X COMMUNICATIONS MENU
ID INET HESN COM1 COM2 EXIT
SETUP X.X HESSEN VARIATION: TYPE 1
SET> EDIT EXIT
SETUP X.X HESSEN RESPONSE MODE :CMD
BCC TEXT CMD ENTR EXIT
Press to
change
response
mode.
ENTR accepts the new
settings
EXIT ignores the new
settin
g
s
Figure 6-9: COMM – Select Hessen Protocol Response Mode
6.6.2.5. HESSEN PROTOCOL GAS ID
The T100 analyzer is a single gas instrument that measures SO
2
. As such, its default gas
ID has already been set to 110. There is no need to change this setting.
6.6.2.6. SETTING HESSEN PROTOCOL STATUS FLAGS
Teledyne API’s implementation of Hessen protocols includes a set of status bits that the
instrument includes in responses to inform the host computer of its condition. Each bit
can be assigned to one operational and warning message flag. The default settings for
these bit/flags are listed in Table 6-7:
06807C DCN6650