Siemens 7SG12 DAD-N - Page 46

7SG12 DAD N Communication Interface
Contents
1. Introduction.......................................................................................................................................................3
2. Reydisp Evolution.............................................................................................................................................3
3. Connection Specification and Relay Settings................................................................................................3
2.1. Recommended cable..................................................................................................................................3
2.2. Connection Method ....................................................................................................................................3
2.3. Transmission Method .................................................................................................................................4
2.4. Transmission Rate......................................................................................................................................4
2.5. Line Idle Setting..........................................................................................................................................4
2.6. Parity Setting..............................................................................................................................................4
2.7. Address Setting..........................................................................................................................................4
4. Modems .............................................................................................................................................................4
3.1 Connecting a modem to the relay(s)...........................................................................................................4
3.2 Setting the Remote Modem........................................................................................................................5
3.3 Connecting to the remote modem ..............................................................................................................5
Figures
Figure 1 - Basic Communications Configuration .................................................................................................6
Figure 2 - Basic Communications Configuration (Remote) .................................................................................7
Figure 3 - Star Type Configuration (Using SIGMA-1 Multiplexer)........................................................................8
Figure 4 - Optical Ring Configuration (Using SIGMA-4 Fibre/RS232 Convertor) ................................................8
Figure 5 – Direct Control System/Data Concentrator Configuration....................................................................9
Figure 6 – Automatic switchover remote to local control using the SIGMA-3......................................................9
Figure 7 – LAN Network connectivity using a SIGMA-3 + Lantronix UDS-10 or equivalent ..............................10
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.
IEC 60870-5-103
The International Electrotechnical Commission’s Standard for communications
with Protection Relays.
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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