Mitsubishi Electric FX5 User Manual page 153

Normal mode
Use this mode for only sending or only receiving.
■Send only
RS2 instruction
OFF ON
execution
SD(TXD)
Send data
OFF
Sending request
DR(DSR)
OFF
(Other device → FX)
OFF
Sending wait flag
ER(DTR)
(FX → other device)
OFF
Turned on when ready
to be transmitted at RS2
instruction execution in
the normal mode.
■Receive only
The DR (DSR) signal is not used.
RS2 instruction
OFF
execution
RD(RXD)
Receive data
OFF
Time out flag
Receiving
OFF
complete flag
ER(DTR)
OFF
(FX → other device)
Turned on when ready to
be transmitted at RS2
instruction execution.
The message 1 is interrupted
because DSR is turned off.
Message Message
1
ON
ON
ON
ON
ON
Message
1
Time out
judgement
time
ON
ON
ON
Turned off due to a
format error or full
buffer during
receiving even if
receiving is not
completed.
Message
1 2
Turned off when
sending is completed
in the normal mode.
Message Message
1 2
Turned off usually on
completion of receiving.
ON
The sequence program resets the flag.
This flag must be turned off to receive the next data.
5 NON-PROTOCOL COMMUNICATION
ON
151
5.7 Programming
5