Section 7. Installation
Term: LSB
Least significant bit (the trailing bit). See the Endianness
(p. 559).
Term: marks and spaces
RS-232 signal levels are inverted logic compared to TTL. The different levels
are called marks and spaces. When referenced to signal ground, the valid RS-
232 voltage level for a mark is –3 to –25, and for a space is +3 to +25 with –3
to + 3 defined as the transition range that contains no information. A mark is
a logic 1 and negative voltage. A space is a logic 0 and positive voltage.
Term: MSB
Most significant bit (the leading bit). See Endianness
(p. 559).
Term: RS-232C
Refers to the standard used to define the hardware signals and voltage levels.
The CR800 supports several options of serial logic and voltage levels
including RS-232 logic at TTL levels and TTL logic at TTL levels.
Term: RX
Receive
Term: SP
Space
Term: start bit
Is the bit used to indicate the beginning of data.
Term: stop bit
Is the end of the data bits. The stop bit can be 1, 1.5 or 2.
Term: TX
Transmit
To Next Page
Loading...
