From PHOENIX CONTACT USA
Modbus is a very simple protocol, and for that reason,
it is very widely used. The simplest topology consists of
a single master (or client), and a slave (server). Multiple
slaves or servers are typical, but having multiple clients
or masters can get very complicated, very quickly. This
paper will explain what a server is, what a client is, and
then provide some simple examples to demonstrate
the client (master)/server (slave) setup.
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