FP2−CCU
Names and Functions of Parts
2 − 4
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)
Flashes while data is being sent
Goes out when no data is being sent
RD (green)
Flashes while data is being received
Goes out when no data is being received
ERR (red)
Lights if communication error occurs
Goes out if normal frame is received
COM. 2 SD (green)
Flashes while data is being sent
Goes out when no data is being sent
RD (green)
Flashes while data is being received
Goes out when no data is being received
ERR (red)
Lights if communication error occurs
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.
Tip
