Specifications

Appendix C - Glossary of Terms RS-422 And RS-485 Applications Ebook
Page 116 of 137 Manual Documentation Number: <DocNumber>
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PLC
Programmable Logic Controller. A microprocessor controlled device that locally
controls some process and usually connects serially to another device or
network of other devices. Usually includes a RS-232, RS-422 or RS-485 serial
connection.
Plenum cable
Plenum rated cable is fire resistant and less toxic when burning than non-
plenum rated cable. Check building and fire codes for requirements. Plenum
cable is generally more expensive due to the sheathing material used.
Plenum Rated
Rating for cable which is fire resistant and less toxic when burning than non-
plenum rated cable.
Point-to-Point
Communication from one device at one location to another device at a second
location. Two devices rather than multi-drop devices.
Port
Electrical interface on a computer or device which permits connection to
another device. Usually, Serial/RS-232, Parallel Printer, Video/VGA/SVGA,
SCSI, Keyboard, IR, USB, Audio, Firewire,
Joystick/Trigger/Game/Controller, Mouse, Ethernet, PCMCIA, Telephone
Modem, or Cellular Modem port.
Electrical connection on a microprocessor that permits the processor to read
inputs or control outputs.
Port Power
USB device that obtains power from the USB port power lines.
A serial/fiber optic/parallel converter which obtains operating power from
the input signals and handshaking lines. It 'steals' power from the device to
which it is connected so that it can power it's own low power circuitry.