MITSUBISHI ELECTRIC FX0N-232ADP User Manual

Page 10

YES

Start

Is power

LED lit?

Is M8063

turned on?

• Check connection with the PC.

• Check power source of PC.

• There is a possibility of send crosstalk. Check the send and receive

timing with the external RS232C device.

• The receive data length may exceed the receive data area.

Check the receive data length and timing of receive start.

• Check that the program is not set so that M8122 may be always on .

• Match the communication format.

• Check the wiring of control line.

• Check the start timing of send, receive.

No send
or receive
error

The data

transfer

complates

once.

No send or receive error

Only receiving

fails to operate

normally

Is send

wait flag M8121

turned on?

Is SD LED

(send) lit up

momentarily?

Is the send

data remainder

zero?

• Check wiring of RS232C cable.

• Check wiring of control line.

• Make sure the receiving external device is normal.

• Check the voltage level of RS232C signal (±9 V).

• Make sure content of send data and communication format

are established before driving RS instruction.

• Check the timing of control line.

• Check the wiring of RS232C cable.
• Check the wiring of control line.
• Match the communication format.
• Make sure the receiving external device is normal.
(CR, LF may be needed in some printers.)
• Check the data format of sending device.

Send,
receive
error

YES

• Check wiring of control line.

• Check timing of send, receive.

• Change RS instruction from OFF to ON.

• Make sure the received data length matches with the receive

data area length.