Omron CQM1H-SCB41 Operation Manual page 116

Overview
Send/Receive Message Frames
Start code
No
256 bytes max.
Yes
ST
Transmission delay
Command sent
1st TXD( )
command
No
Data
Data
ST
256 bytes max.
• Only the first start code is valid if there is more than one start code.
• Only the first end code is valid if there is more than one end code.
• Use CF+LF if using an end code may cause receptions to be interrupted
because the end code exists in the receive data.
• A transmission delay can be set for PC-initiated communications as a
minimum interval between sending commands to the host.
The delay is not used in sending the first command. The delay will affect
other commands only if the time set for the transmission delay has not ex-
pired when the next command is ready to be sent.
If the delay time has already expired when the next command is ready, the
command will be spent immediately. If the delay time has not expired, the
command will be delayed until the time set for the transmission delay has
expired.
The operation of the transmission delay for PC-initiated communications is
illustrated below.
Transmission delay
Command sent
2nd TXD( )
command
Refer to the CQM1H Programming Manual for details on TXD( ) and
RXD( ).
End code
Yes
Data
ED
256 bytes max.
Data
ED
256 bytes max.
Transmission delay
Command sent
3rd TXD( ) 4th TXD( )
command command
Section 6-1
CR+LF
Data
CR+LF
256 bytes max.
Data
ST CR+LF
256 bytes max.
Command sent
Time
101