Panasonic FP2 ET-LAN Technical Manual page 235

Sample communication timing chart
(1) Single-frame command and single-frame response
(2) Multiple-frame command and single-frame response
(3) Single-frame command and multiple-frame response
(4) When multiple-frame command is aborted before being completed
Note:
When a transmission is split into several frames and sent, after one frame has been sent, the next frame
cannot be sent until a transmission request message (*1 in the sample communication timing chart) has
been received from the partner side. If multiple frames are being received, a transmission request
message (*2 in the sample communication timing chart) should be sent to the partner side so that the
next frame can be received.
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