DA70131-1/3E
II-14
5-4-3. Fixed output data timing
The I/O device refreshes the received data while the output signal, "
_____
MSEL ", is LOW (indicates that the data
was successfully received). The refresh timing will be slightly advanced or delayed, depending on the data
receive timing of the center device (G9001A). However, when "
_____
MSEL " changes from LOW to HIGH, the I/O
device must have already read the received data. Therefore, if you want to use the received data by another
external device, take out the data during
_____
MSEL is HIGH so that you can get reliable data.
5-4-4. Input data set timing
The I/O device reads the data input on the ports using basically the same timing for the output data.
It sends the data it receives to the center device (G9001A) in the response frame.
The I/O device reads the data on its input lines while
_____
MSEL is LOW. To send it data from outside, do so
while
_____
MSEL is HIGH, so that the I/O device will be looking at stable data when the signal goes LOW again.
Also, unless it is receiving cyclic communications from the center device (G9001A) normally, the I/O device
(G9002A) will not read data that is sent to its input ports.
_____
MSEL
Px (7:0)
Refreshed output data
_____
MSEL
Internal register
Px (7:0)
Содержание Motionnet G9001A
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