User`s manual

FX communication
RS instruction 9
9-6
9.2 Hardware Hand Shake Operation
9.2.1 FX, FX
2C
, FX
0N,
FX
1S
, FX
1N
and FX
2N
(earlier than V 2.00)
In the FX, FX
2C
, FX
0N,
FX
1S
, FX
1N
and FX
2N
(earlier than V 2.00), half duplex communication is
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
……
D8120
〈
(b12, b11, b10) = (0, 0, 0)
〉
Note:
* In FX
1S
, FX
1N
, FX
0N
, FX and FX
2C
series, the period should be longes 2 scan times or more.
Reset it using a program.
When it is not trurned off, the next
data cannot be received.
Data 1
RS instruction
driving
Send wait
flag M8121
Send data
SD (TXD)
OFF
ON
Data 4
Data 2 Data 3
OFFON
Send request
M8122
Receive data
RD (RXD)
Receive
completion
M8123
OFF ON ON
ONOFF
* This period should be
100
µ
s or more
The receive wait
status is started