Specifications

Appendix C - Glossary of Terms RS-422 And RS-485 Applications Ebook
Page 125 of 137 Manual Documentation Number: <DocNumber>
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Surge Suppressor
A device which suppresses voltage or current surges on serial data lines, AC
input power lines, telephone/facsimile lines, or antenna/cable TV lines.
Switching Power Supply
A power supply that operates by turning off/on rapidly (switching) to convert
DC to AC at some frequency (usually 15.734KHz or less) that can use a small
core transformer. The AC is then rectified back to DC. The DC voltages on the
secondary side may provide feedback to the primary side for voltage
regulation. The transformer provides isolation. Optical feedback isolates the
secondary side from the primary side. A switching supply for AC line power
usually converts the AC to DC before converting it back to higher frequency
AC, then DC. Many AC supplies are designed for Worldwide power and handle
240/220/120/100 VAC at 50/60Hz.
A DC/DC converter is a switching supply.
T
TD
Transmit Data. The data Output line on a computer/DTE device, the input line
on a modem/DCE device.
TDA(-)
The (-) line in a RS-422 (or four-wire RS-485) transmit pair. This line is
negative relative to the TDB(+) line during a idle or MARK state.
TDB(+)
The (+) line in a RS-422 (or four-wire RS-485) transmit pair. This line is
positive relative to the TDA(-) line during a idle or MARK state.