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Communications
Protocols
A set of rules for data exchange (format and timing of data) in a communications
system
Stack / profile = selected set of protocols for a communication application
| Ethernet |
CAN-Open
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| Modbus |
Plus
ASi |
| Modbus |
Seriplex
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| S908 |
FIPIO/FIPway
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| LonWorks |
RIO |
| Interbus |
HART |
| Profi-bus |
DIO |
| DeviceNet |
ControlNet |
| Uni-Telway |
ASCII |
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Protocols
are similar to languages - Devices must support the same protocol to
understand each other
Communication Relationships
Master / Slave - request / response & response only
Peer-to-Peer - client / server, publisher / subscriber
Communication Architectures
Star (point-to-point)
Bus, Ring, LAN (multidrop)
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