Hardware Hand Shake Operation; Fx, Fx 2C , Fx 0N, Fx 1S , Fx 1N And Fx 2N (Earlier Than V 2.00) - Mitsubishi Electric MELSEC FX Series User Manual

FX communication
9.2

Hardware Hand Shake Operation

9.2.1 FX, FX , FX
2C
In the FX, FX
performed.
Accordingly, when the send flag is turned ON while data is received, the send wait flag M8121 is
turned on. When the receive completion flag is changed from OFF to ON, send is started.
1 ) Do not use hardware hand shake
RS instruction
driving
Send data
SD (TXD)
Send request
M8122
Send wait
flag M8121
Receive data
RD (RXD)
Receive
completion
M8123
Note:
* In FX , FX
1S
FX , FX and FX
0N, 1S 1N
, FX FX , FX
2C 0N, 1S 1N
OFF ON
Data 1
ON
The receive wait
status is started
, FX , FX and FX
1N 0N
(earlier than V 2.00)
2N
and FX (earlier than V 2.00), half duplex communication is
2N
...... 〈
D8120 (b12, b11, b10) = (0, 0, 0)
OFF
OFF
* This period should be
µs or more
100
Data 2
OFF ON
series, the period should be longes 2 scan times or more.
2C
〉
Data 4
ON
Data 3
ON
Reset it using a program.
When it is not trurned off, the next
data cannot be received.
RS instruction 9
9-6