Mitsubishi Electric AJ71QC24 Manual page 131

6. BIDIRECTIONAL PROTOCOL COMMUNICATIONS MELSEC QnA
If you have any situations as follows, please read the explanations
Data cannot be sent from external device
**Transmission to PC in bidirectional mode**
.........
Send data?
.........
Error code was received from the PC CPU ?
**Transmission to PC in bidirectional mode*'
Send data?
. . . . .
Communications error!! Error code=
:
........
Reset transmission (Y/N) ?
Was the sequence program (Section 6.6.1) writ-
ten to the PC CPU ?
Are the QC24 mode switch settings (Section 6.2),
cable connections (Section 3.3), and other set-
tings correct ?
Check the QC24 LEDs (Section 6.3), then check
the settings.
NAK was sent from the QC24.
Are the QC24 awitch settings (Section 6.2), ex-
ternal device settings (Section3.4)) and external
device program m (RS-232C) settings (Section
6.6.2) correct ?
Check the QC24
LEDs (Section 6.3), then check
the settings.
Is the number of characters input from the key-
board as send data an odd number ?
(Sinve the send data count is in word units, key-
in an even number
of
characters.)
Refer to the Serial Communications Module Use's
Manual
for
the contents of the displayed error
code and take appropriate action.
After resetting the settings, reset the PC CPU and communicate again.
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