Omron CS1W-SCU21 Operation Manual page 225

CompoWay/F Master Protocol
Communications Specifications
Transmission Procedure
The PC 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 message is returned
for each command message. The movement of command and response messages is shown below.
Master (PC or host computer)
Slave (component)
Command and Response Formats
Note In the following diagrams "Hex" indicates hexadecimal values. Values in quotation marks, such as "00"
indicate ASCII characters.
Command Format
Response Format
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.
206
Item
Transmission path Multipoint
connections
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 Horizontal parity (none, even, or odd) (Default: Even)
BCC (block check character)
*1: Start-stop Sync Data Configuration for Protocol Macros
LRC, 1 byte, equivalent to binary
Command message
Node No.
Subaddress
"00"
1 byte 2 bytes 2 bytes
Node No. Subaddress
"00"
1 byte 2 bytes 2 bytes
Specification
Response message
Text
Command
Data
"0"
1 byte
End code
Response
Text
"00" Data
(See note.)
2 bytes
Appendix B
1 byte 1 byte
1 byte 1 byte