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PD 664 LED indicators

A PD 664 GPRS device is equipped with 3 LED indicators, “Error” (red), “On” (green), and (green) “Link”. The state of the device is indicated by the LEDs, according to the scheme shown in the table.

Meaning	Error (Red)	On (Green)	Link (Green)
No power	OFF	OFF	OFF
Initialising	OFF	ON	OFF
GPRS Connection, no traffic	OFF	ON	ON
GPRS Connection, traffic	OFF	ON	Flashing
Error (RAM, FLASH, EEPROM,  module) or P-NET sync error, Watchdog Error	ON	ON	ON, OFF, or Flashing
No SIM card detected or no valid GPRS configuration	Flashing	ON	OFF

If the Error LED is ON, the cause can be found by reading the ChError.Act bits 8-12 in the Service, GPRS and SMS Channels.