Mitsubishi Electric MELSEC FX Series User Manual page 142

FX communication
4 ) Operation chart
(M0)
BFM#1 b0
Send/receive enable
(M1)
BFM#1 b1
Send command
BFM#13
Number of remaining
send data
Send
BFM#1001 to #1256
Send buffers
BFM#28 b0
(M10)
Send completion
BFM#14
Number of receive
buffers
BFM#2000
Receive byte count
Receive
BFM#2001 to #2256
Receive buffers
(M11) BFM#28 b1
Receive completion
BFM#1 b2
(M2) Receive completion reset
command
9 8
7
6 5
4 3
BFM#1000
Send byte count
3
2
1
0
5
4
3
2
1
0
Contents of receive buffers are also cleared.
BFM#2
Receive upper
limit byte count
2 1
0
Send completion status is also reset
by next send command.
4
8
7
6
When not reset
FX -232IF 10
2N
10-22