Omron CQM1H-SCB41 Operation Manual page 155

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)
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.
140
Item
Transmission path
connections
Communications
Synchronization
Baud rate
Transmitted code
Data length
Stop bits
Error detection
Command message
Slave (component)
1 byte
1 byte
Specification
Multipoint
RS-232C, RS-422A/485, 4-wire half-duplex, 2-wire half-duplex
Start-stop
1,200/2,400/4,800/9,600/19,200 bps
Default: 9,600 bps
ASCII
7 bits or 8 bits (Default: 7 bits)
Note A 7-bit code is used with 0 added to the beginning.
1 bit or 2 bits (Default: 2 bits)
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
Response message
Node No. Subaddress
"00"
"0"
2 bytes 2 bytes 1 byte
Node No. Subaddress End code
"00"
"00"
2 bytes 2 bytes 2 bytes
Appendix B
Text
Command
Data
1 byte
Response
Text
Data
(See note.)
1 byte 1 byte
1 byte