Kongsberg Simrad TV80, Reference Manual

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406388/F
signalling events, across the transmission medium per time unit using a
digitally modulated signal or a line code. The symbol rate is measured in
baud (Bd) or symbols per second. In the case of a line code, the symbol rate
is the pulse rate in pulses per second. Each symbol can represent or convey
one or several bits of data. The symbol rate is related to the gross bit rate
expressed in bits per second.
https://en.wikipedia.org/wiki/Symbol_rate
Data Bits
Use this function to specify the number of data bits for serial communication.
The standard number of data bits defined for NMEA serial line communication is
8 (eight).
Parity
Use this function to specify the parity for the serial communication. The standard
parity defined for NMEA serial line communication is "None".
A parity bit , or check bit is a bit added to the end of a string of binary code
that indicates whether the number of bits in the string with the value one is
even or odd. Parity bits are used as the simplest form of error detecting code.
[...] In serial data transmission, a common format is 7 data bits, an even parity
bit, and one or two stop bits. This format neatly accommodates all the 7-bit
ASCII characters in a convenient 8-bit byte. Other formats are possible; 8 bits
of data plus a parity bit can convey all 8-bit byte values.
https://en.wikipedia.org/wiki/Parity_bit
Handshake
When you set up a serial line to an external device, the handshake will help you to
control the flow of data. The handshake allows the external device to stop sending
data if the Processor Unit is not ready for it. It also prevents the Processor Unit
from sending data when the external device is not ready for it.
Simrad TV80 Reference Manual