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Operating Instructions
6.9.1. COM Port Default Settings
As received from the factory, the analyzer is set up to emulate a DCE or modem,
with pin 3 designated for receiving data and Pin 2 designated for sending data.
DEFAULT BAUD RATE: 19,200 bits per second.
DATA BITS: 8 with One stop bit. No Start bit.
PARITY: None.
The RS-232, db-9 connector on the analyzer's Rear panel is configured as follows:
Cables that appear to be compatible because of matching
connectors may incorporate internal wiring that make the link
inoperable. Check cables acquired from sources other than
6.9.2. COM Port Physical Connections
There are two connectors DB-9 connectors on the M400E Rear Panel. COM-A is
populated with a male connector, COM-B with a female connector (see Table 6-18
for the pin out). T-API offers two mating cables one of which should be applicable
for your use:
db-9 female to db-9 pin female – p/n WR000077. Allows connection of COM-A
with the serial port of most personal computers.
db-9 female to db-25pin male – p/n WR0000024. Allows connection to the
most common styles of modems (e.g. US Robotics Sportster).
Both cables are configured with straight through wiring and should require no
additional adapters.
To assist in properly connecting the serial ports to either a computer or a modem
there are activity indicators just to the side of both COM ports (presently only those
for COM-A are functional). When power is applied to the analyzer the red LED next
to the COM port should be illuminated. If it is not then there is something wrong
with the CPU or the wiring between the CPU and the motherboard.
Once a cable is connected between the analyzer and a computer or modem both
the red and green LED's should be ON. If not, for COM-A switch the DTE-DCE
switch on the rear panel to exchange the receive/transmit lines. If both LED's are
still not illuminated, check the cable to make sure it is constructed properly. For
COM-B it may be necessary to install or construct a null-modem (contact customer
service for information).
116
NOTE
T-API pin-for-pin before using.
Model 400E Ozone Analyzer
Instruction Manual
P/N 04316 Rev: B
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