Hitachi HX-RIO3 Series User Manual page 28

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If you try to write more than 1024 bytes on RX buffer, 1025rd byte overwrites the first byte on RX buffer.
Thus, it is recommended to write less than 1024 bytes.
IR (Initialization Request) bit set
Control Byte #0
RxD Buffer data Reset.
Offset
Input Byte #1
Input Byte #2
Input Byte #3
Input Byte #4
Input Byte #5
Input Byte #6
.
.
.
Input Byte #1021
Input Byte #1022
Input Byte #1023
Input Byte #1024
bit#7 bit#6 bit#5
TPR FT
0 0
RxD Buffer Data
0x00
0x00
0x00
0x00
0x00
0x00
.
.
.
0x00
0x00
0x00
0x00
bit#4 bit#3
FR ---- ----
0 0 0
HX-RIO3 Series
bit#2 bit#1 bit#0
RA TR
0 0
IR
1