Transmission Request Does Not Make The "Sd" Led Blink - Mitsubishi QJ71C24N User Manual

11 TROUBLESHOOTING

11.3.4 Transmission request does not make the "SD" LED blink.

Symptom
• Due to the OFF status of
the CS(CTS) signal, the Q
• Although a
series C24 cannot transmit
transmission request
data to the external device.
was made, "SD" does
• Due to transmission
not blink.
control (DTR or DC
control), the external
device cannot receive data.
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Cause
• While the CS(CTS) signal is OFF, the Q series C24
does not transmit data to the external device.
It must be ON when the external device is ready to
receive data.
• Wait until the external device is ready to receive data.
• When the waiting time is too long, check the external
device or cable condition.
Corrective action
MELSEC-Q
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