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:
| Master |
|
request |
|
|
response |
| |
Slave | Slave | Slave |
| Response analysis |
|
| and preparation |
|
Wait | of next exchange | Wait |
| ||
MASTER | request |
|
request |
| |
to slave 1 | to slave N | |
SLAVE 1 |
|
|
response |
| |
request processing |
| |
SLAVE N |
| response |
|
| |
PHYSICAL |
|
|
MEDIA |
|
|
Exchange i |
| Exchange i+1 |
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