Omron CQM1-ARM21 Operation Manual page 19

Introduction
Request
Response
Power On
Offline
Lists = default
Phase
Detection
search for slaves
Phase
with addr. 0 - 31
Activation
activation of slaves
Phase
exchange data with Data Exchange
each active slave
Phase
send one command
Management
to only one slave
Phase
(read status, ...)
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
ST=0 CB A4 A3
5 Bit Address
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
ST=0 I3
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.
Initialisation
Start Up Operations
Normal Operation
Inclusion
Phase
A2 A1 A0 I4 I3
5 Bit Information
I2 I1 I0
4 Bit
Information
Parity bit
Section 1-1
search for new slaves
and inclusion of slaves
found, using one master
request per cycle
I2 I1 I0 PB EB=1
Parity bit
End bit
PB EB=1
End bit
5