Omron CQM1-ARM21, Руководство по эксплуатации, Страница: 19 / 86

Introduction
Section 1-1
5
Activation
Data Exchange
Phase
Lists = default
search for slaves
with addr. 0 - 31
activation of slaves
exchange data with
each active slave
send one command
to only one slave
(read status, ...)
Initialisation
Detection
Phase
Phase
Management
Phase
Normal Operation
Inclusion
Phase
Start Up Operations
Power On
Offline
Phase
and inclusion of slaves
search for new slaves
found, using one master
request per cycle
Request
All requests, sent by the master and received by the slave in any phase, have
a fixed format. They are composed of the following elements:
Start bit
Control bit
5 Bit Address 5 Bit Information
Parity bit
End bit
ST=0 CB A4 A3 A2 A1 A0 I4 I3 I2 I1 I0 PB EB=1
Response After each master request, the master will wait for a response from the
targeted slave. The responses sent by the slaves have no control bit and no
address, and are always composed as shown below:
Start bit
4 Bit
Parity bit
End bit
ST=0 I3 I2 I1 I0 PB EB=1
Information
In normal operation, master requests and slave responses will alternate on
the bus. If a slave cannot execute the master request, it will not respond to
the request. If no slave response is detected within 10 bit times, the master
will send the next master request to ensure a constant poll cycle for all active
slaves.