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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APC 6000 user manual Jbus protocol