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Glossary
Baud Rate
Bit
Bits Per Second (BPS)
Data Bits
Half-Duplex
Asynchronous
Communications
Hayes 'AT'
IEC 60870-5-103
Master Station
Modem
Parity
Parity Bit
Primary Station
PSTN
RS232C
Secondary Station
Slave Station
Start Bit
Stop Bit
©2010 Siemens Protection Devices Limited
See bits per second.
The smallest measure of computer data.
Measurement of data transmission speed.
A number of bits containing the data. Sent after the start bit.
Communications in two directions, but only one at a time.
Modem command set developed by Hayes Microcomputer products, Inc.
The International Electrotechnical Commission's Standard for communications
with Protection Relays.
See primary station.
MOdulator / DEModulator device for connecting computer equipment to a
telephone line.
Method of error checking by counting the value of the bits in a sequence, and
adding a parity bit to make the outcome, for example, even.
Bit used for implementing parity checking. Sent after the data bits.
The device controlling the communication.
Public Switched Telephone Network
Serial Communications Standard. Electronic Industries Association
Recommended Standard Number 232, Revision C.
The device being communicated with.
See secondary station.
Bit (logical 0) sent to signify the start of a byte during data transmission.
Bit (logical 1) sent to signify the end of a byte during data transmission.
MSCDN – MP2A Communication Interface
Chapter 4 – Page 3 of 11
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