User`s manual

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CHAPTER 9 CONTENTS AND REGISTRATION OF THE USER FRAMES FOR DATA COMMUNICATION
9
9.1 User Frame Types and Contents During Communication
(b) Variable data designation contents, data contents transmitted and received, and
handling by the Q series C24
The table below shows the register codes (FFH+00H) to (FFH + FFH) combinations for handling variable data,
the data contents that are transmitted and received, and how the Q series C24 handles the data.
Combinations other than those listed in the table cannot be registered.
*1 For usage of the register code, there are restrictions on versions of QJ71C24N(-R2/R4) and QJ71C24(-R2).
Refer to the Q Corresponding Serial Communication Module User's Manual (Basic) for how to check the version.
*2 During data communication using a user frame that handles the last frame, the contents of the "sum check code" set in
the transmission setting using the GX Developer switch setting will be ignored.
*3 Calculation ranges for the register codes
Changeable data
register code
Data contents transmitted and received/Q series C24 handling
Calculation
range
*3
Detailed
explanation
1st byte 2nd byte
FFH
00H
Transmission: Transmits the data code 00H (NUL) data (1 byte).
Reception: Skips the given part (1 byte) of the receive user frame. (Skips the check and performs
receive processing.)

1)
01H
Transmits and receives the station No. set in the GX Developer switch setting as 1-byte binary code
data (00H to 1FH).
2)
04H
*1
Transmits and receives the horizontal parity code in the calculation range using 1 byte of binary code
data
Range 1
3)
05H
*1
Transmits and receives the horizontal parity code in the calculation range using 2-byte ASCII code
data
0AH
*1
Transmits and receives the horizontal parity code in the calculation range using 1 byte of binary code
data
Range 2
0BH
*1
Transmits and receives the horizontal parity code in the calculation range using 2-byte ASCII code
data
11H
*1
Transmits and receives the two's complement sum check code in the calculation range.
Range 1
4)
17H
*1
Range 2
E5H
*1
Transmits and receives the sum check code in the calculation range.
*2
(Except the last one frame)
Range 3 6)
EBH
*1
Range 4 7)
EEH
Transmits and receives the sum check code in the calculation range.
*2
Range 1
5)
F0H
F1H
F3H
F4H
Range 2
F6H
F7H
F9H
FFH Transmits and receives the register code FFH data (1 byte). 