Specifications

Chapter 2 - System Configuration RS-422 And RS-485 Applications Ebook
Page 42 of 137 Manual Documentation Number: <DocNumber>
www.bb-elec.com/
www.bb-europe.com/
Using Fractional Load Receivers to Extend Distance and
Number of Nodes
Another method of increasing the number of RS-485 nodes is to use
low (fractional) unit load type RS-485 receivers. These receivers use a
higher input impedance to reduce the load on the RS-485 drivers to
increase the total number of nodes. There are currently half, quarter
and eighth unit load integrated circuit receivers available, extending
the total allowable number of nodes to 64 and 128.