1 Introduction
1-22
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
1-7
Selecting the Serial Communications
Mode
•
Section 7 Using
Serial Communications Mode
Reference
•
Host computer
Creating
communications
frame for a host
computer protocol
Protocol macro
Standard system
protocol
Use a standard
system protocol.
User-created
protocol
Use the CX-Protocol to
change a standard
system protocol.
•
OMRON
component
Protocol macro
Protocol macro
•
Section 4 Using
Protocol Macros
•
Section 5 Serial
Gateway
•
CX-Protocol Operation
Manual (W344)
Connect Device
Execute using ExecPMCR instruction.
Execute using SendCmd instruction.
Through network
Execute using SendCmd instruction.
Through network
Serial Gateway
Serial Gateway
Serial Gateway
Serial Gateway
Serial Gateway
CompoWay/
F-compatible
•
Modbus-com-
patible device
(including
OMRON
components)
Modbus-RTU-
compatible
Modbus-ASCII-
compatible
Execute using SendCmd instruction.
Through network
•
General-
purpose
external device
Protocol (including
no-protocol) used
mainly for stop-start
synchronous data
sending and reception
Use the CX-Protocol to
create a new protocol.
Protocol macro
•
Section 4 Using
Protocol Macros
•
CX-Protocol Operation
Manual (W344)
•
Section 6 No-protocol
Mode
No-protocol
Sending/receiving
data in a single
direction from/to a
device such as a bar
code reader or printer
No-protocol
User-created protocol
using user program
Modbus-RTU
Slave
Modbus-RTU
commands
sent from host
Modbus-RTU Slave
Mode