Specifications

Appendix C - Glossary of Terms RS-422 And RS-485 Applications Ebook
Page 115 of 137 Manual Documentation Number: <DocNumber>
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interconnected. Various configurations are available (See 232MFNM Data
Sheet).
RS-232 devices may require DSR cross connected to DTR, and to CD, and RTS
to CTS. (note that a regular MODEM cable has connections to the same pins on
both sides)
O
Optical Isolation
Electrical isolation provided by converting the electrical signal to light, then
converting the light back to electrical signal. The optical isolator consists of a
light emitting diode and phototransistor in one package. This is a better
method of providing circuit isolation for some types of signals than by using
signal transformers, radio frequencies or surface wave/acoustic isolators.
P
Parity Bit
A binary digit that is added to ensure that the number of bits with value of one
in a given set of bits is always even or odd. It may also be a Mark (1), or a
Space (0).
Pinouts
A labeled figure or numbered list/diagram showing pin layout/index or which
shows the signal name and pin number for each connection to a device. The
pinouts on a device help technicians to wire connectors or cables and to make
the proper signal connections (or omit connections) between devices. Pinouts
on many devices such as RS-422 or RS-485 are non-standard, so diagrams are
usually needed unless the connection copies a widely accepted product such as
the parallel printer Centronics connections on a printer (some may be added or
omitted), or the IBM PC printer connector (DB25F), or the RS-232 DB25M (PC)
or DB9M (PC/AT).