Specifications

Chapter 5 - Software RS-422 And RS-485 Applications Ebook
Page 65 of 137 Manual Documentation Number: <DocNumber>
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Software
RS-422 and RS-485 are hardware specifications. Protocols, which are
implemented in software, are not discussed in either specification.
Typically, in an existing system, the user is confined to using whatever
software is part of the system. In the case of a system designer
creating a new system, it may be possible to obtain, or define, a
protocol suitable for their system.
This chapter does not attempt to define a protocol standard, but will
explain some of the issues that must be understood by personnel
installing, maintaining or designing RS-422/485 systems.
5 In This Chapter
RS-422 Systems .......................................................................................... 66
RS-485 Driver Control ................................................................................. 66
RS-485 Receiver Control .............................................................................. 68
Master-Slave Systems ................................................................................. 68
Multi-Master RS-485 Systems ....................................................................... 70
Systems with Port Powered Converters ......................................................... 71
CHAPTER 5