
Flex M Engineered Receiver Instruction Manual
October 2014
Page 17 of 49
4.1.1 RF/CPU LED OPERATION
When the Flex M system is supplying power to the RF/CPU module, there is a series of LEDs that will
indicate the RF/CPU module’s status.
Figure 6. GEN1 RF/CPU Module LED Placement
WDG/ONLINE LED:
o Solid indicates RF communication with transmitter
o 1 Blink indicates normal operating WDG
o 2 Blinks indicates RF communication loss with transmitter
RF MSG LED:
o Fast Blinks indicates radio frequency messages received (typical is 4 to 10 messages per
second). This confirms communication between transmitter and receiver
o 3 Steady Blinks indicates read/write error to an attached Flex M module
o 4 Steady Blinks indicates an internal radio error
RF SIGNAL LEDs
o Measures the strength of the RF communication signal from the transmitter
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