c
c.
e-
c
L.
L
P-
c-
P
APPENDICES
'
._.
r
,
*
MELSEC-A
(3)
Ignoring wrong data
L.
c
c
P
P
When any station is not transmitting data, the send line is in the high
impedance state.
Thus, the send line may become unstable due to noise, causing a
computer to receive wrong data.
Since a parity error or a framing error may occur in this case, error data
must be ignored.
When using protocol
1
to
4,
either ACK, NAK, or
STX
code is transmitted
first.
Therefore until an ACK, NAK, or
STX
code
is
received, other codes must
be ignored.
When a computer does not have a pull-up/down register, insert a resis-
tance (4.7
KC3
1/4W as a standard resistance value) to prevent a receive
of wrong data.
When a computer has a pull-up/down register, wrong data
is
not received.
APP-12
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