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6. BIDIRECTIONAL
PROTOCOL
COMMUNICATIONS
MELSEC QnA
If you have any situations as follows, please read the explanations
Even though send data is set to the PC CPU and the
Was the sequence program (Section 6.5.1) writ-
Request to Send signal is turned ON
~~
**
Reception from PC in bidirectional mode
**
Wait to receive data !
Send data from PC.
When sending data from the PC CPU
I
**
Reception from PC in bidirectional mode
**
Communications error!! Error code=0022
Receive again (Y/N) ?
ten to the PC CPU ?
Are the QC24 mode switch setting (Section 6.2)
and cable connections (Section 3.3) and other
set tings correct ?
Check the QC24 LEDs (Section 6.3), then check
the settings.
AK was sent from the external device.
Are the external device settings (Section 3.4)and
QC24 switch settings (Section 6.2) correct
?
Check the QC24 LEDs (Section 6.3), then check
the settings.
When send data and external device receive data are
Are the QC24 switch settings (Section 6.2) and
different
**
Reception from PC in bidirectional mode
**
Receive again (Y/N) ?
computer progaram (RS-232C setting) settings
(Section 6.5.2) correct ?
Check the QC24 LEDs (Section 6.3), then check
the settings.
After resetting the settings, reset the PC CPU and communicate again.
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