Receive Time-Out Time <Bfm #3; Send Header <Bfm #5 (Upper), Bfm #4 (Lower); Send Terminator <Bfm #7 (Upper), Bfm #6 (Lower) - Mitsubishi Electric MELSEC FX Series User Manual

FX communication
Receive Upper Limit Byte Count 〈BFM #2〉
10.2.4
Setting range: 1 to 512 (when buffer data length is 16 bits)
BFM #2 specifies the maximum byte count received by the 232IF.
When data is received up to the receive upper limit byte count, the receive completion status
(BFM #28 b1) is set.
When the receive terminator (BFMs #11 and #10) or the receive time-out time (BFM #3) is set
and the set condition is satisfied, it is regarded that receive is completed even if the data received
is within the receive upper limit byte count.
10.2.5 Receive Time-out Time <BFM #3>
Setting range: 1 to 32,767 (x 10ms)
BFM #3 specifies the receive data waiting time limit.
When the next data is not received within the receive time-out time starting from the receive edge
of each data, the receive time-out flag (BFM #28 b2) is set to "ON", it is regarded that receive is
completed, and the receive completion status (BFM #28 b1) is set.
10.2.6 Send Header <BFM #5 (upper), BFM #4 (lower)>
Setting range: 4 bytes maximum, zero suppression
For the send data of the 232IF, 4 headers maximum can be specified. When the number of
headers is less than 4, the upper "0"s are ignored (zero suppression) and not transferred.
BFM #5
(upper 2 bytes)
b15
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0
0
4th
• The transmission order is fourth header, third header, second header, first header when 4
headers are specified.
10.2.7 Send Terminator <BFM #7 (upper), BFM #6 (lower)>
Setting range: 4 bytes maximum, zero suppression
For the send data of the 232IF, 4 terminators maximum can be specified. When the number of
terminators is less than 4, the upper "0"s are ignored (zero suppression) and not transferred.
As the first terminator, specify an ASCII code from 01
terminators, any ASCII code can be specified.)
The register structure and the transmission order are equivalent to those of the send header
described above.
1 to 256 (when buffer data length is 8 bits)
"0" is regarded as "512" or "256". The initial value is "0".
"0" eliminates time-out time. The initial value is "0".
The initial value is "0" (No used).
(lower 2 bytes)
b0 b15
0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0
0 0 0
3rd 2nd
The initial value is "0" (No used).
BFM #4
b0
0
0 2
1st
Example:02H (STX)
H
FX
to 1F . (As the second to fourth
H
-232IF 10
2N
10
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