Panasonic FP2 - Manual (Page 20)

FP2−CCU Names and Functions of Parts
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2.1 Names and Functions of Parts
2.1.2 Operating Status LEDs
These display the operating status of the unit, such as communication conditions and
error/alarm situations.
Display Operation
ALARM (red)
Lighted: Unit error (lights on watchdog timer error)
Not lighted: Goes out when there is no error
COM. 1 SD (green)
Send Data monitor
Flashes while data is being sent
Send Data monitor
Goes out when no data is being sent
RD (green)
Receive Data monitor
Flashes while data is being received
Receive Data monitor
Goes out when no data is being received
ERR (red)
Communication error
Lights if communication error occurs
Communication error
Goes out if normal frame is received
COM. 2 SD (green)
Send Data monitor
Flashes while data is being sent
Send Data monitor
Goes out when no data is being sent
RD (green)
Receive Data monitor
Flashes while data is being received
Receive Data monitor
Goes out when no data is being received
ERR (red)
Communication error
Lights if communication error occurs
Communication error
Goes out if normal frame is received
LED status ( : Lighted : Flashing : Not lighted)
The communication error (ERROR LED) lights if a parity, framing, overrun,
or BCC error occurs.
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