APC 6000 user manual Jbus protocol

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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:

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

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Contents Mgetm GalaxyTM GTC link communication interface2 6739389EN/FB Contents ACQ module PresentationIntroduction COM moduleCommunication settings InterfaceJbus protocol Principle Synchronizing data exchangesDescription of request and response frames Checking received messages on the slave side Functions Function 1 and 2 read N bitsFunction 3 and 4 read N words Function 5 writing a bitFunction 8 reading error diagnosis counters Function 6 writing a wordFunction 11 reading event counters Function 15 writing n consecutive bitsFunction 16 writing n consecutive words MSB LSB MSB LSB MSBCRC 16 algorithm Example of CRC computation Example of CRC 16 computation in C using table lookup Table of Most Significant Bytes for CRC16 ComputationJbus protocol UPS theory of operation Unitary UPSParallel connected UPS with Static Switch cubicle Operation without batteryUPS without Mains Operation with battery Block diagram Unitary UPSMeasured quantities Normal operation Load on battery Main status bits UPS operating informationOperating modes Load on Mains Load on bypass Parallel connected UPS Normal operation Load on battery Disconnected Main status bits of system operationsStatic Switch cubicle Static Switch Main indicators of system operationsNormal operation Load on Mains Load on bypass System information Example of read data array commands sent by the terminalSample commands List of variable fields Message formatGeneral definitions Signaling field Tables of measured dataCurrent fields Power fields Frequency fields Voltage fieldsBattery and adjustments fields Tables of binary dataRectifier-charger Inverter ConnectivityTable of control devices Global informationGlossary of information descriptors Word addressInverter stack overload 0=no/1=overload Word address 4A Word address 4CWord address 4D Word address 4E summaryC10 call reset 0= not activated / 1=activated Word address C1

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