参数资料
型号: 20-151-0178
厂商: Rabbit Semiconductor
文件页数: 64/162页
文件大小: 0K
描述: CABLE CONVERTER RS-232 TO USB
标准包装: 1
附件类型: USB 至 RS232 适配器
适用于相关产品: 基于 Rabbit 的板
产品目录页面: 619 (CN2011-ZH PDF)
其它名称: 20-151-0178-ND
316-1181
5.2 Serial Communication
Dynamic C provides drivers for RS-232 and RS-485. For a full discussion of these drivers, see the Techni-
cal Note, TN213: “Rabbit Serial Port Software.”
5.2.1 Comparison of RS-232 and RS-485
Both RS-232 and RS-485 are popular and well-established serial communication protocols that are used
by many different devices. There are a number of considerations when choosing which serial protocols are
right for a particular application. The following table looks at both protocols and compares these consider-
ations.
Table 5-3. Serial Communication Parameters
Parameter
Max number of drivers
Mode of operation
Topology
Max distance
Max slew rate
1
Full-duplex
End-to-end
15 m
30 V/μs
RS-232
RS-485
32
Half-duplex
Multidrop, with node-to-node
communication
1200 m
n/a
RS-485 was developed to overcome some of the limitations of RS-232, such as the distance between trans-
mitter and receiver. RS-485 also has a more open topology, allowing the RabbitFLEX BL300F to be part
of a multidrop network of serially connected devices.
Figure 5.1 Multidrop Network Wiring
5.3.1 Termination Resistors
You can design the RS-485 circuit to include termination resistors or not. A third option is to have select-
able termination. For best performance in a multidrop network, termination resistors are enabled only on
the end nodes and are disabled on intervening nodes.
At the time of this writing, more information on the termination of transmission lines can be found at:
58
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