| Start |
Is power | |
LED lit? | |
| YES |
Is M8063 | |
turned on? | |
No send | NO |
or receive | |
error |
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Only receiving fails to operate normally
NO
Is send
wait flag M8121
turned on?
NO
Is SD LED
(send) lit up momentarily?
YES
Is the send
data remainder
zero?
YES
| NO | • | Check connection with the PC. |
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| • Check power source of PC. |
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| YES | The data | NO | • | Match the communication format. | |||||
| transfer | • | Check the wiring of control line. | |||||||
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| Send, | complates |
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| • | Check the start timing of send, receive. | |||||||
| receive | once. |
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| error |
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| No send | or receive error | |||
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| • | There is a possibility of send crosstalk. Check the send and receive | |||
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| YES |
| timing with the external RS232C device. | ||||
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| • | The receive data length may exceed the receive data area. | |||||
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| Check the receive data length and timing of receive start. | |||
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| • | Check that the program is not set so that M8122 may be always on . | |||
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YES
1
• Check wiring of control line. YES • 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.
NO • 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.
NO
• 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.