6-3-(5)
Host Link Serial Interface
Section 6-3
Using the TXD Instruction
With this method, the command is not set in the Read Area, it is actively trans-
mitted from the Programmable Controller to the Controller. Set the Read area
to None in the Communications (Host link) window.
Note
If a response is not received within 5 seconds, a timeout error will occur in the
Controller because the Programmable Controller may be disconnected or mal-
functioning. An error message will be displayed on the Controller’s screen and
the parallel interface’s ERR signal will be turned ON.
Controller Settings
Communications Speed and Communications Mode
Use the following procedure to set communications specifications such as the
baud rate and data length. Set the same communications specifications in the
Controller and the external device.
1.
Move the cursor to MON or RUN and press the ENT Key.
2.
Select SYS.
Controller
Set the number of bytes of transmission
data to 12 bytes. (Words that aren't
included in the command format can be
set to 0 or 1.)
Programmable Controller
(Unit number: 00 (fixed))
Execute the command.
Write the processing results
to the Write Area.
Return response indicating that
the write operation was completed
normally.
The parallel interface's BUSY signal
will be ON during measuring.
Command to output
processing results?
Execute the TXD instruction.
End
Yes
No
---- ---ms
0.Scn 0
MON
Image 0 freeze
SET
MON
RUN
SYS
TOOL
SAVE
