Mitsubishi MELSEC AJ65BT-R2 User Manual page 160

7 USING FRAMES WHEN EXCHANGING DATA
Special
Function during transmission/reception
character code
During transmission:
The data code 00
transmitted.
0
During reception:
H
The check of the section corresponding to the
registration frame (1 byte worth) is skipped.
(Received as normal data.)
1 to BF Use prohibited
H H
Data in a random registration frame is transmitted
according to the RX and RY ON/OFF state and
C0 to DF
H H
RW value comparison.
Refer to (c) for details.
E0 to ED Use prohibited
H H
The check sum corresponding to the designated
range of the statement is transmitted and received
EE to FA for checking the statement to be transmitted or
H H
received.
Refer to (d) for details.
FB to FE Use prohibited
H H
FF The data code FF
H
(b) Functions of special characters, and usability during
transmission/reception
(NUL) data (1 byte) is
H
data (1 byte) is received.
H
(c) RX/RY/RW reference special characters
The RX/RY/RW reference special characters refer to the ON/OFF state of
the master station's designated remote input(RX)/remote output (RY), and
the remote register (RW) value, and transmit the designated registration
frame data according to the details.
The RX/RY/RW reference special characters are designated with the
following arrangement.
FF
Special character code
H
1st byte 2nd byte
Transmission
Frame
transmission
transmission
(Frame -1)
Head End
RX/RY, RW designation
3rd, 4th byte
7 - 26
MELSEC-A
Usability
Frame
Monitor
transmission
(Frame -2)
–
–
–
: Usable,
(Designation of registration frame, etc.)
5th byte and followings
Reception
Frame
reception
Head End
: Not usable