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RS-232C Interface Unit Communications
Section 6-1
Operation by Operating Commands
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:
Message from Host to NT20S
Host program NT20S operation
Message to PT Process message
Message operating command
Enquiry from Host to NT20S
Host program NT20S operation
Enquiry operating command
Enquiry
Receive command
Receive command
Send response command
Response operating command
Notification of Operation at NT20S to the Host
Host program NT20S operation
Receive notification
Notification operating command
Send notification command
Operation by Terminal Commands
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 NT20S operation
Message to PT
Terminal command
Process message
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