MacFinish 2D-USB Handleiding

Page 88
MacFinish 2D-USB and MF8.x software
APPENDIX D: Explanation of Words
• Baud
◦ 1) The signalling rate of a line. It’s the switching speed, number of transitions that are made per second.
Only at low speeds are bauds equal to bits per second; for example: 300 baud is equal to 300 bps.
However, one baud can be made to represent more than one bit per second. For example, the V.22bis
modem generates 1200 bps at 600 baud.
◦ 2) Commonly (and erroneously) used to specify bits per second for modem speed. For example: 1200 baud
means 1200 bps. See previous paragraph.
• Baud Rate
◦ A redundant reference to baud. Baud is a rate.
• Parity bit
◦ An extra bit attached to the byte, character or word used to detect errors in transmission.
• Parity Checking
◦ An error detection technique that tests the integrity of digital data within the computer system or over a
network. Parity checking uses an extra ninth bit that holds a 0 or 1 depending on the data content of the
byte. Each time a byte is transferred or transmitted, the parity bit is tested.
◦ Even parity systems make the parity bit 1 when there is an even number of 1 bits in the byte. Odd parity
systems make it 1 when there is an odd number of 1 bits.
• Stop Bit
◦ In asynchronous communications, a bit transmitted after each character.