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FX Series Programmable Controllers Points Of Technique 10
10-20
10.14.3 Timing diagrams for communications:
1) No Handshakin
g
D8120 (b12, b11, b10) = (0, 0, 0)
FX
2N
below version 2.0
*When usin
g
FX
0N
, FX, FX
2C
this should be 2 x scan time or more
2) Terminal mode D8120 (b12, b11, b10) = (0, 0, 1)
a) Send Onl
y
b) receive onl
y
Reset usin
g
a pro
g
ram.
When it is not turned off, the
next data cannot be received.
Data 1
RS
instruction
Send wait
fla
g
M8121
Send data
SD (TXD)
OFF
ON
Data 4
Data 2 Data 3
OF
F
ON
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
Data 1
RS
instruction
Send data
SD (TXD)
OFF
ON
Data 2
Send request
M8122
ON
OFF
Data 1
ER(DTR)
OFF
OFF
ON
ON
DR(DSR)
Reset usin
g
a pro
g
ram.
When it is not turned off, the next data cannot be received.
Data 1
OFF
ON
OFF
ON
ON
Data 2
OFF ON
RS
instruction
Receive data
RD (RXD)
ER(DTR)
ON
Receive
completion
M8123