Omron CQM1H-SCB41 Operation Manual page 94

Protocol Structure
Level
Send message
SD (00) _1
Receive message
RV (00) _1
Handling
Communications
Problems for Standard
System Protocols
Item
Header <h> "@"
Terminator <t> [2A0D]
Error check code <c> LRC (horizontal parity) (0) (2 bytes of ASCII)
Length <l> ---
Address <a> $ (R (1) ) ,2)
Message edited
<h> + <a> + "1" + "00" + "0000" + <c> + <t>
Header <h> "@"
Terminator <t> [2A0D]
Error check code <c> LRC (horizontal parity) (0) (2 bytes of ASCII)
Length <l> ---
Address <a> & (R (1) ) ,2)
Message edited
<h> + <a> + "00" + "00" + & (W (1) ,4) + <c> + <t>
The CQM1H-series PCs provide standard system protocols to enable com-
munications with OMRON components without having to create communica-
tions sequences. The sequences in the standard system protocols can be
executed merely by setting operands for the PMCR( ) instruction.
Processing for communications line problems during communications for the
standard system protocols are set to normal settings, as shown in the follow-
ing table. If these settings are not suitable to the application or if improve-
ments are desired, use the CX-Protocol to modify the following settings in the
required sequences. For details on the use of the CX-Protocol, refer to the
CX-Protocol Operation Manual (W344). Refer to the appendices for the set-
tings in the standard system protocols.
Level
Sequence Link words
parameters
Transmission control
parameters
Response notifica-
tion method
Reception wait time Tr The monitoring times are set to 3 seconds for
Reception finished
wait time Tfr
Send finished wait
time Tfs
Step param- Repeat counter
eters
Command
Retry count
Send wait time
Send message
Receive message
Response write
enable
Next process
Error process
Setting
Data
Data
Item Possible changes in settings
No reason to change.
most sequences. The settings are different for
send-only and receive-only sequences, as
well as for sequences that require time for
responses.
No reason to change.
The retry count is general set to 3 retries (4
tries total) for sequences that use the
SEND&RECEIVE command. Different set-
tings are used for sequences that have other
commands.
No reason to change.
Section 5-5
79