ZHCSRU3J January 2008 – March 2023 SN65HVD1785 , SN65HVD1786 , SN65HVD1787 , SN65HVD1791 , SN65HVD1792 , SN65HVD1793
PRODUCTION DATA
- 1 特性
- 2 應用
- 3 說明
- 4 Revision History
- 5 Product Selection Guide
- 6 Pin Configuration and Functions
- 7 Specifications
- 8 Parameter Measurement Information
- 9 Detailed Description
- 10Application and Implementation
- 11Power Supply Recommendations
- 12Layout
- 13Device and Documentation Support
- 14Mechanical, Packaging, and Orderable Information
10.2.1.1 Data Rate and Bus Length
There is an inverse relationship between data rate and cable length, which means the higher the data rate, the short the cable length; and conversely, the lower the data rate, the longer the cable length. While most RS-485 systems use data rates between 10 kbps and 100 kbps, some applications require data rates up to 250 kbps at distances of 4000 feet and longer. Longer distances are possible by allowing for small signal jitter of up to 5 or 10%.
Figure 10-3 Cable Length vs Data Rate CharacteristicEven higher data rates are achievable (for example, 10 Mbps for the SN65HVD1787 and SN65HVD1793) in cases where the interconnect is short enough (or has suitably low attenuation at signal frequencies) to not degrade the data.