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40-400-00022 Rev. B
EIA
Electronic Institute Association.
ESD
Electrostatic Discharge.
FCC
Federal Communications Commission. Federal organization in Washington
DC set up by the Communications Act of 1934. It has the authority to
regulate all interstate (but not intrastate) communications originating in the
United States.
IED
Intelligent Electronic Device. Any device that uses a microchip controller to
process data, usually associated with the utility industry. Typical devices
include digital fault recorders, relays, and electronic meters
IEEE
Institute of Electrical and Electronic Engineers. A publishing and standards-
making body responsible for many telecommunication and computing
standards.
LED
Light Emitting Diode. A semiconductor diode that emits light when a current
is passed through it. Used for status and information displays on electronic
devices.
PSTN
Public Switched Telephone Network.
RI
Ring Indication. This signal is on pin 9 of the 9-pin RS-232-C connector.
RMS
Root mean square. Method of measuring voltage, current or power.
RS-232-C
Latest version of EIA/TIS-232-E. A set of standards specifying various
electrical and mechanical characteristics for interfaces between computers,
terminals and modems.
RTS
Request To Send. This signal is on pin 7 of the 9-pin RS-232-C connector.
One of the control signals on a standard RS-232-C connector. It places the
modem in the originate mode so it can begin to send.
RXD
Receive Data. This signal is on pin 2 of the 9-pin RS-232-C connector. Line
for the received data on a serial port following RS-232-C.
