: , (120 )
: 15- CRC-
: ;
: CAN 2.0B
: 1 /
: 30
: ~ 64 ( )
Profibus.
PROFIBUS PROcess Field BUS, . Profibus 1987 ., 1996 . .
Profibus ( DP PA) ( FDL FMS). , , Profibus.
Profibus
Profibus :
, , RS-485;
- ;
.
9,6 / 12 /.
Profibus . 2 OSI ( Profibus FDL). (. token). Profibus (. master) (. slave) . , ( ), ( ). . , . , ( master-slave). , .
Profibus DP, , FMS .
OSI Profibus FDL- (Field- bus Data Link ). MAC (Medium Access Control ) , . :
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() .
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Profibus (. 2.23). (.. ), . , .
Profibus , , , , .
Modbus.
Modbus Modbus [135-137] . ( - Modbus 1979 .), Modbus , , , . Modbus- , 2006 . [135].
Modbus (Profibus CAN ), . , . , www.modbus.org.
Modbus Profibus. , , , Modbus. , Modbus , . Modbus () -.
Modbus /, .
Modbus Modbus Plus [137] - Modbus TCP [144], Ethernet .
Modbus : RTU (Remote Terminal Unit ) ASCII. , RTU Modbus , ASCII . , , Modbus, .
Modbus RTU, Modbus ASCII . , Modbus ASCII - DC0N, Advantech ICP DAS Modbus.
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Modbus RS-485, RS-422 RS-232. 2- RS-485. - RS-232 RS-422.
17. ( )
, () . .
, OSI , , , . , , .
:
, , , , ;
( -40 +70 );
, , , ;
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;
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( , );
( ).
. Ethernet Internet , :
LAN (Local Area Network) , ( , , );
MAN (Metropolitan Area Networks) ;
WAN (Wide Area Network) , . - .
. , , , , .