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Appendix BCompoWay/F Master Protocol
138
Communications Specifications
Item Specification
Transmission path
connections
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 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
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 message
Response message
Command and Response Formats
Note In the following diagrams “Hex” indicates hexadecimal values. Values in quotation marks, such as “00” indi-
cate ASCII characters.
Command Format
Node No.
Subaddress
Command
Text
1 byte 2 bytes 2 bytes 1 byte 1 byte
1 byte
Data
”00”
”0”
Response Format
Node No.
Subaddress
End code
Response
Text
1 byte 2 bytes 2 bytes 2 bytes
1 byte 1 byte
Data
(See note.)
”00”
”00”
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.