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JBUS protocol
Introduction
JBUS protocol can be used to read
or write one or more bits or words.
In the interest of simplicity, this
document describes only the
procedures necessary for operation
and monitoring of the APC by
Schneider Electric unit.
Communications are initiated by
the master and include a request
from the master and a response
from the slave.
Master requests must be
addressed to one specific slave
(identified by its address in the first
byte of the request frame) as
shown in the diagram opposite:
Response analysis
and preparation
of next exchange
MASTER
SLAVE 1
SLAVE N
PHYSICAL
MEDIA
request
request
response
to slave 1 to slave N
response
request processing
Exchange i
Exchange i+1
Wait
Wait
Master
Slave
Slave Slave
request
response