Mitsubishi Electric MELSEC IQ-R series Reference Manual page 156

Word length
Specify the word length of the buffer memory to be read/written.
■Data communication in ASCII code
Convert the numerical value to 4-digit ASCII code (hexadecimal), and send it from the upper digits.
■Data communication in binary code
Send 2-byte numerical values from lower byte (L: bits 0 to 7).
Ex.
For 5 words and 20 words
Number of device points
5 words
20 words
Read data, write data
The read buffer memory value is stored for reading, and the data to be written is stored for writing.
This function reads/writes data in word unit.
■Data communication in ASCII code
Convert the numerical value to 4-digit ASCII code (hexadecimal), and send it from the upper digits.
■Data communication in binary code
Send 2-byte numerical values from lower byte (L: bits 0 to 7).
Ex.
When the data for one buffer memory address is 09C1H
ASCII code
0 9 1
C
30 39 43 31
H H H H
10 BUFFER MEMORY ACCESS
154
10.1 Buffer Memory
ASCII code
0 0 0 5
30 30 30 35
H H H H
0 0 4
1
30 30 31 34
H H H H
Binary code
C1 09
H H
Binary code
05 00
H H
14 00
H H