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APPENDIX B: TIPS ON CONNECTING THE
TELEDYNE API ANALYZER RS-232 INTERFACE
Teledyne API analyzers use the RS-232 communications protocol to allow the instrument
to be connected to a variety of computer based equipment. RS-232 has been used for
many years and as equipment has become more advanced, connections between various
types of hardware have become increasingly difficult. Generally, every manufacturer
observes the signal and timing requirements of the protocol very carefully. Problems
arise when trying to specify connectors, and wiring diagrams that attach the analyzer to
various devices.
The problem centers around two areas.
connectors. Second is the wiring of the connectors. This Note will attempt to provide
some guidelines for connecting the Teledyne API analyzers to a variety of other
equipment
Pin
1
Not Used
2
Transmit Data
3
Receive Data
4
Not Used
5
Signal Ground
6
Not Used
7
Data Set Ready (DSR)
8
Request to Send (RTS)
9
Not Used
RS-232 PIN ASSIGNMENTS
FIGURE B.1
2. Gender changers - convert a male connector to a female connector or vice versa. They
do so WITHOUT changing the pin-to-pin wiring.
3. Adapters - these change from one type plug (DB-9) to another type plug (DB-25).
They do so WITHOUT changing the wiring.
P/N 02163G Teledyne API Model 300 CO Analyzer Instruction Manual - Page 102
First is the physical incompatibility of
Signal
Connectors:
There is a wide variety of connectors
and cables that are specified to
operate with the RS-232 protocol.
This is because electronics have
decreased in size over the years and
connectors have been downsized to
match the electronics.
Cables & Adapters come
in 4 general types
1. Cables - cables are provided in
various lengths from 6 to 50 feet. In
most cases they have a male
connector at one end and a female at
the other. Variations on this are ones
that provide both a cable and
adapter.
For example the cable
provided with our analyzer adapts a
female DB-9 to a male DB-25
connector.
Most cables do not
contain a Null modem.
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Troubleshooting
