Getac Technology Corporation ZX70U Manual De Usuario
AS3993 – AN13 – Received Signal Strength Indicator (RSSI)
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Revision 2.0 / 6/22/12
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Indicator LEDs:
Figure 9 - Reader Indicator LEDs
The three indicator LEDs on the reader part together with the LED on the controller part are
used to display error states at the start-up of the reader system. LSB (bit 0) is the controller LED
and reader LEDs D1 – D3 are bit 1 – bit 3. If an error occurs during the start-up the LEDs are
slowly flashing the error code.
Error Codes:
0 : Everything OK. Controller LED flashes fast.
1 : writing + reading SPI failed.
2 : Reset via EN low + high failed.
3 : IRQ line failed.
4 : Crystal not stable (Bit0 in AGC and Internal Status register 0x2A)
5 : PLL not locked (Bits1 in AGC and Internal Status register 0x2A)
Example - PLL not locked: Controller LED and reader LED D2 are flashing slowly.