Datasheet

0
1
2
3
4
0 20 40 60 80 100 120 140
Differential Load Resistance - W
V = 5 V
CC
Differential Output Voltage - V
V = 4.75 V
CC
SN65HVD96
SLLSE35B – JUNE 2010– REVISED NOVEMBER 2011 www.ti.com
APPLICATION INFORMATION
Sympol™ States
Using Sympol to Achieve Immunity to Crossed Bus Wire
Many applications which use RS-422 or RS-485 are wired on-site by third-party installers. This opens the door to
the possibility of miss-wiring, especially for far-flung networks with many stations (or nodes). Neither RS-422 nor
RS-485 allows correct communications when the bus wires (typically a twisted-pair) are swapped.
The existing solutions for this case require active intervention, either by the installer or maintenance technician,
or by an automated controller. Sympol offers a way to replace RS-422 or RS-485 networks with communication
over the same bus lines. Due to the innovative nature of Sympol signaling levels, a Sympol network is immune to
communication errors caused by crossed bus wires.
Signaling levels are similar to RS-422 and RS-485, so signaling rates, cable lengths, and noise immunity will be
comparable.
Sympol is NOT interoperable with RS-422 or RS-485; that is, designers may not mix Sympol nodes with existing
RS-485 nodes.
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