235
V530-R160
Operation Manual
SE
C
T
IO
N
8
Se
rial
Int
e
rf
ac
e (Hos
t Link)
SECTION 8
Communication with the Host
Using TXD Instructions
This is a method in which commands are not set in the Read Area but are actively sent from the
programmable controller to the controller.
Set the
Read Area
to
None
.
While the command is being executed, the BUSY signal of the parallel
I/O interface is ON.
A timeout error occurs if there is no response within
5 seconds and it is assumed that the line is broken or
the programmable controller is not working correctly.
An error message is displayed on the screen and the ERR
signal of the parallel I/O interface is turned ON.
Programmable Controller
Unit number: 00 (Fixed)
F160
Controller
Executes command.
Writes data to the Write Area.
Returns write completed
response.
[Write Area]
END
Issue the TXD command.
Set "3 bytes" for the number
bytes of send data.
