Mitsubishi Electric MELSEC-A Manual Book page 98

6. COMMUNICATIONS IN THE 6lDIRECTIONAL MODE
MELSEC-A
When data cannot be trans-
mitted from the computer.
*'TRANSMITTING DATA TO PC
IN BIDIRECTIONAL MODE"
SEND DATA?
:
-.
_ _ _ _ ;
,
-
- - - - - -
.
When the PC CPU sends an
error code.
**TRANSMITTING DATA TO PC
IN BIDIRECTIONAL MODE"
SEND DATA?
: .______
1
COMMUNICATIONS
ERROR!!
ERROR CODE
4::::::::
,
- -
-
- - - -
,
RESET AND
RETRANSMIT
WIN)?
After making the correct settings, reset the PC CPU to restart
communications.
is displayed.
is displayed.
Is the sequence program (Section 6.5.1)
written to the PC CPU?
Are the AJ71 UC24 mode setting switch set-
ting (Section 6.1) and the cable connections
(Section 3.3) correct?
Check the indicator LEDs on the AJ71 UC24
(6.2), then reexamine the setting and the
connections.
Has the AJ71 UC24 sent the NAK signal?
Are the AJ71UC24 switch settings (Section
6.1), the computer settings (Section 3.4),
and the computer program (RS-232C) set-
tings (Section 6.5.2) correct?
Check the indicator LEDs on the A171 UC24
(Section 6.2), then reexamine the settings.
I s
the total number of characters of the send
data entered from the keyboard odd?
(Because the data is to be transmitted in
word units, it must be composed of an even
number of characters.)
For details of the error code displayed, refer
to the Computer Link Module User's Manual,
and take proper action.
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