Omron NT20S Operation Manual page 221

RS-232C Interface Unit Communications
Operation by Operating Commands
Message from Host to NT20S
Enquiry from Host to NT20S
Notification of Operation at NT20S to the Host
Operation by Terminal Commands
202
The operating commands display monitored data from the production line and
messages to the factory workers. They are also used for NT20S control and man-
agement.
The communication flow between the Host and NT20S differs according to the fol-
lowing three cases:
Host program
Message to PT
Host program
Enquiry
Receive command
Host program
Receive notification
The terminal commands allow the NT20S to be used as a terminal of the Host to
display text and graphics independently of the screens stored in the NT20S.
The Host sends a command and the NT20S processes the message. The NT20S
does not send back a response to the Host.
Host program
Message to PT
Message operating command
Enquiry operating command
Response operating command
Notification operating command
Terminal command
Section 6-1
NT20S operation
Process message
NT20S operation
Receive command
Send response command
NT20S operation
Send notification command
NT20S operation
Process message