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Teledyne API – Model T400 Photometric Ozone Analyzer Getting Started
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and Section 3.3.1.8: Connecting the Communications Interfaces, ”RS-232
Connection”. )
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 (Section 5.7.1) is unique for each. On the front panel menu, use
SETUP>MO
RE>COMM>ID. The default ID is typically either the model number or
“0”; to change the 4-digit identification number, press the button below the digit to be
changed, and press/select ENTER to accept the new ID for that instrument).
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.
8. Next, in the SETUP>MORE>COMM>COM1 menu (do not use the COM2 menu),
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; refer to Section 6.2.2).
Note
The Instrument ID’s should not be duplicated.
The (communication) Host instrument can only address one instrument at a time.
06870C DCN6332