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Teledyne API T801 NDIR CO2 Analyzer Operation Manual Getting Started
45
Analyzer Analyzer Analyzer Last Analyzer
Female DB9
Male DB9
RS-232
COM2
RS-232
COM2
RS-232
COM2
RS-232
COM2
Host
RS-232 port
Ensure jumper is
installed between
JP2 pins 21
22 in
last instrument of
multidrop chain.
Figure 3-15: RS-232-Multidrop PCA Host
/Analyzer Interconnect Diagram
7. BEFORE communicating from the host, power on the instruments and check
that the Machine ID is unique for each (Section 5.7.1).
a. In the SET
UP Mode menu go to SETUP>MORE>COMM>ID. The default
ID is typically the model number or “0”.
b. to change the identification number, press the button below the digit to be
changed.
c. Press/select ENTER to accept the new ID for that instrument.
8. Next, in the SETUP>MORE>COMM>COM1 menu (do not use the COM2
menu for multidrop), edit the COM1 MODE parameter as follows:
press/select EDIT and set only QUIET MODE, COMPUTER MODE, and
MULTIDROP MODE to ON. Do not change any other settings.
9. Press/select ENTER to accept the changed settings, and ensure that COM1
MODE now shows 35.
10. Press/select SET> to go to the COM1 BAUD RATE menu and ensure it
reads the same for all instruments (edit as needed so that all instruments are
set at the same baud rate).
Note
Teledyne API recommends setting up the first link, between the Host and the
first analyzer, and testing it before setting up the rest of the chain.
Note
The (communication) Host instrument can address only one instrument at a
time, each by its unique ID (see step 7 above).
07274B DCN6418