![background image](http://html1.mh-extra.com/html/omron/cj1w-scu22/cj1w-scu22_operation-manual_742498342.webp)
A Standard System Protocol
R-8
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
The PLC or host computer serving as the master sends a command and the component serving as the
slave returns a response for the command message contained in the command. One response mes-
sage is returned for each command message. The movement of command and response messages is
shown below.
Note
In the following diagrams "Hex" indicates hexadecimal values. Values in quotation marks, such
as "00" indicate ASCII characters.
Command Frame
Response Frame
Note 1
Data is not saved in the response if there is a command frame error (i.e., if the end code is
not 00 or 0F).
2
Other values are possible for the subaddress and SID.
R-2-2
Communications Specifications
Item
Specification
Transmission path con-
nections
Multipoint
Communications
RS-232C, RS-422A/485, 4-wire half-duplex, 2-wire half-duplex
Synchronization
Start-stop
Baud rate
1,200/2,400/4,800/9,600/19,200/38,400 bps
Default: 9,600 bps
Transmitted code
ASCII
Data length
7 bits or 8 bits (Default: 7 bits)
Note: A 7-bit code is used with 0 added to the beginning.
Stop bits
1 bit or 2 bits (Default: 2 bits)
Error detection
Vertical parity (none, even, or odd) (Default: Even)
BCC (block check character)*
*: Start-stop Sync Data Configuration for Protocol Macros
LRC, 1 byte, equivalent to binary
R-2-3
Transmission Procedure
R-2-4
Command and Response Formats
Master (PLC or host computer)
Slave (component)
Command message
Response message
Node No.
Subaddress
Command
Text
1 byte
2 bytes
2 bytes
1 byte
1 byte
1 byte
Data
"00"
"0"
Node No.
Subaddress
End code
Response
Text
1 byte
2 bytes
2 bytes
2 bytes
1 byte
1 byte
Data
(See note.)
"00"
"00"
Содержание CJ1W-SCU22
Страница 192: ...4 Using Protocol Macros 4 56 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 250: ...6 No protocol Mode 6 22 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 460: ...A Standard System Protocol R 126 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494...
Страница 473: ...Index 1 CJ series Serial Communications Units Operation Manual for NJ series CPU Unit W494 I Index...