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Reception data read request signal of QJ71C24N not turn ON
In a system in which QJ71C24N series module operates and the non procedure protocol is used, the RD LED turns on but Reception data read request signal X3/XA does not turn ON. The receive complete code LF (0AH) has already been sent from an external device.Why does the signal not turn ON?
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Answer
The default receive complete code is CR+LF (0DH, 0AH). The default received data count is 511 words. Hence, at their defaults, Reception data read request signal X3/XA turns ON with the timing with which CR+LF is received or 511 words are received.
Change the setting of the receive complete code using any one of the following methods.
1. Using GX Works2
Set "Various Control Specifications" of the intelligent function module utility.
2. Using GX Configurator-SC
Make "CH1/CH2 Non procedure system setting".
3. Using a sequence program:
Create a program in which a TO instruction writes 0AH (LF) into the buffer memory address A5H/145H on the rising edge of X1E.
Change the setting of the receive complete code using any one of the following methods.
1. Using GX Works2
Set "Various Control Specifications" of the intelligent function module utility.
2. Using GX Configurator-SC
Make "CH1/CH2 Non procedure system setting".
3. Using a sequence program:
Create a program in which a TO instruction writes 0AH (LF) into the buffer memory address A5H/145H on the rising edge of X1E.
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- Network Related Products
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- Computer Link / Serial Communication
