Panasonic FP2 ET-LAN Technical Manual page 132

Note:
The size of the receive request data should be specified so that it is less than or equal to the size of the
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receive buffer x 2, and should be specified in byte units.
The receive complete signal does not go on until the amount of data received is equal to the receive
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request data size in the connection information setting area.
If "FFFFH" has been specified for the receive request data size, direct reception is carried out. With
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direct reception, the receive request signal goes on each time a packet is received.
If the received data exceeds the receive request data size, the receive data notified signal remains on
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even after the receive complete signal has gone off. In this case, reception data can continue to be
read by turning on the receive request signal again.
The next time data is to be received, always check to make sure the receive complete signal is off
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before executing the reception processing.
The user is notified of the content of an error by means of a receive processing end code and an error
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log.
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