Hardware Hand Shake Operation; No Hardware Hand Shake - Mitsubishi Electric MELSEC FX Series User Manual

FX communication

10.3 Hardware Hand Shake Operation

10.3.1

No Hardware Hand Shake

Setting BFM#0 (b9, b8)=(0, 0)
Send/receive
enable
(BFM#1 b0)
Send
command
(BFM#1 b1)
Send data
SD(TXD)
Send
completion
(BFM#28 b0)
Receive data
RD(RXD)
Receive
completion
(BFM#28 b1)
Receive
completion reset
command
(BFM#1 b2)
*1 Turn off using a program. When it is turned ON, the next data cannot be sent.
*2 Time set by BFM#20 (x10ms).
*3 Turn it off using a program. When it is turned ON, the next data cannot be sent.
*4 After receive is completed and the data is read, turn off the receive completion flag (BFM #28
b1) using a receive completion reset command (BFM #1 b2).
OFF
ON
*1
OFF ON
Data 1
BFM#20
*2
X10ms
OFF
Data 2
OFF
OFF
The receive wait
stafus is started.
*1
ON
ON
*3
ON
*4
Data 4
BFM#20
*2
X10ms
Data 3
*4
FX -232IF 10
2N
*3
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