14 ON-DEMAND DATA COMMUNICATIONS USING USER FRAMES
14.4 Example of On-Demand Data Transmission Program Using User Frames
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• The SPBUSY instruction is used to read the communication status by the dedicated instruction. (Page
520 Dedicated Instructions)
• Designate the storage capacity for send data (stored in D10 to D11 in the above program example) and data
length (stored in D2 in the above program example) so that they do not exceed the range of buffer memory
assigned by the user for the on-demand function.
(0) On-demand transmission direction pulse
(3) Set the transmission channel to the CH1 side.
Set the send data quantity to two-word.
Set the data to be transmitted.
Reset the normal completion flag.
Reset the abnormal completion flag.
Set the execution direction.
(61) Normal completion
(63) Abnormal completion
(65) Reset the execution direction.
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