Sharp ER-3100 Installation Manual page 52

8.6.2 Data sending and receiving
1. Receiving
The ER-OIFD is always in the receive mode when the power is on.
When receiving data, make sure the floppy disk is correctly set.
2. Sending
The ER-OIFD starts data transfer when the RUN key is pressed.
Prior to pressing the RUN key, make sure that the ER-31OO is in
the receive mode and that the floppy disk is correctly set.
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