Mitsubishi MELSEC L Series User Manual page 263

<<Wait until data communications are enabled>>
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<<Start communications after M2 turns ON>>
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11 DATA COMMUNICATIONS USING USER FRAMES
<First frame No. (for reception) designation, 1st to 4th>
<Last frame No. (for reception) designation, 1st to 4th>
<Reception format designation 2 to 3, format-1 specified>
<Format-1 received data count designation 2 to 3>
<Set to enable user frame>
<Reception is ready>
<Reads combination No.>
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<Reads reception data>
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User frame setting for reception
(See Section 11.2.4.)
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Reads combination of received user frames
Sets to CH1 for reception channel
Sets to 20 for No. of allowable reception data
Executes reception
Sets normal completion flag
Sets abnormal completion flag
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