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Model 9110TH NOx Analyzer Getting Started
Teledyne Analytical Instruments 51
Figure 3-14: Default Pin Assignments for CPU COMM Port Connector (RS-232).
TAI offers two mating cables, one of which should be applicable for your use.
P/N WR000077, a DB-9 female to DB-9 female cable, 6 feet long. Allows connection of the
serial ports of most personal computers.
P/N WR000024, a DB-9 female to DB-25 male cable. Allows connection to the most
common styles of modems (e.g. Hayes-compatible) and code activated switches.
Both cables are configured with straight-through wiring and should require no additional adapters.
Note Cables that appear to be compatible because of matching connectors
may incorporate internal wiring that makes the link inoperable. Check
cables acquired from sources other than TAI for pin assignments before
using.
To assist in properly connecting the serial ports to either a computer or a modem, there are activity
indicators just above the RS-232 port. Once a cable is connected between the analyzer and a computer
or modem, both the red and green LEDs should be on.
If the lights are not lit, locate the small switch on the rear panel to switch it between DTE
and DCE modes.
If both LEDs are still not illuminated, ensure that the cable properly constructed.
Received from the factory, the analyzer is set up to emulate an RS-232 DCE device.