Panasonic FP0R User Manual page 132

Communication
Different end code settings for sending and receiving
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can only be determined by a time-out using the IsReceptionDone-
ByTimeOut function or by evaluating the data in the receive buffer (see
p. 128).
Sometimes you do not want to send an end code, but need an end code in
the data received to set the "reception done" flag to TRUE. In this case,
select the desired end code in the system registers and execute
F159_MTRN specifying a negative number for n_Number.
Send 4 bytes of data without adding an end code:
POU Header
LD Body
FP0R User's Manual