7SG11 Argus 8 Communication Interface
Contents
Figure 1 - Basic Communications Configuration..................................................................................................6
Figure 2 - Basic Communications Configuration (Remote)..................................................................................6
Figure 3 - Star Type Configuration (Multiplexer).................................................................................................7
Figure 4 - Data Concentrator Configuration........................................................................................................7
Figure 5 - Optical Ring Configuration .................................................................................................................8
Figure 6 - Configuration using the Sigma 3 – Dual Port RS232 Device..............................................................8
Glossary
Baud Rate
See
bits per second
.
Bit
The smallest measure of computer data.
Bits Per Second (BPS)
Measurement of data transmission speed.
Data Bits
A number of
bits
containing the data. Sent after the
start bit
.
Half-Duplex
Asynchronous
Communications
Communications in two directions, but only one at a time.
Hayes ‘AT’
Modem command set developed by Hayes Microcomputer products, Inc.
Master Station
See
primary station
.
Modem
MOdulator / DEModulator device for connecting computer equipment to a
telephone line.
Parity
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.
Parity Bit
Bit
used for implementing parity checking. Sent after the
data bits
.
Primary Station
The device controlling the communication.
PSTN
Public Switched Telephone Network
RS232C
Serial Communications Standard. Electronic Industries Association
Recommended Standard Number 232, Revision C.
Secondary Station
The device being communicated with.
Slave Station
See
secondary station
.
Start Bit
Bit
(logical 0) sent to signify the start of a byte during data transmission.
Stop Bit
Bit
(logical 1) sent to signify the end of a byte during data transmission.
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Chapter 4 Page 2 of 8