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| 型號： | AN1816 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | USING THE HC912B32 TO IMPLEMENT THE DISTRIBUTED SYSTEMS INTERFACE (DSI) PROTOCOL |
| 中文描述： | 使用本HC912B32為實施分布式系統(tǒng)接口（DSI）協(xié)議 |
| 文件頁數(shù)： | 2/24頁 |
| 文件大?。?/td> | 332K |
| 代理商： | AN1816 |
AN1816
2
Application Note
Distributed Systems Interface (DSI) Overview
The Distributed Systems Interface (DSI) was designed to interconnect
multiple remote sensor and actuator devices to a central control module.
It provides simultaneous support for sensors and actuators using a
2-wire bus that provides both power and communications. This results in
savings in wiring costs and connector complexity. Unlike conventional
systems, the size of the connector for the control module does not need
to grow to accommodate every new sensor or actuator. A new sensor or
actuator can be added to the bus without reconfiguring the system
design. The DSI, therefore, enables the development of easily
expandible systems.
The DSI communication bus is simple yet robust. Signals are
superimposed onto the power line and, as communication between the
master and slave nodes is bi-directional, the DSI makes efficient use of
bus bandwidth. Also, to ensure message integrity, each message
contains a 4-bit Cyclic Redundancy Check (CRC).
Slave nodes can be attached to the bus in daisy chain or parallel
connections. Each slave device on a bus has a unique address. The
daisy chain connection allows the central module to establish the node
addresses at power-up. The parallel configuration can be used for
devices that have pre-programmed or fixed addresses. It is possible to
have a combination of the two on one bus with the maximum number of
nodes on a DSI bus being 16 (1 master and 15 slaves).
Signalling
The DSI uses two mediums for signalling - voltage mode for messages
from the master to the slaves, and current mode for the responses from
the slaves.
Voltage Mode
Encoding
The voltage mode signal bits are sent on a 2:1 ratio as shown in
Figure
1 Voltage Mode Bit Encoding
.
Figure 1 Voltage Mode Bit Encoding
Logic 1
Logic 0
Logic 0
Logic 1
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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