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@@ -14,12 +14,17 @@ I'm focusing on a SIM4320(A) chip:
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GPRS
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---
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-| Raspberry Pi Pin | FONA Pin |
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-|---|---|
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-| 3.3v (1) | Vio (4) |
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-| GND (6) | GND (3) |
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-| TXD (8) | RX (6) |
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-| RXD (10) | TX (7) |
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+| Raspberry Pi Pin | FONA Pin | Description |
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+|---|---|---|
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+| 3.3v (1) | Vio (4) | Sets logic level, must be externally powered (RPi -> FONA) |
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+| GND (6) | GND (3) | |
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+| TXD (8) | RX (6) | RPi transmit -> FONA receive |
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+| RXD (10) | TX (7) | RPi recieve <- FONA transmit |
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+| GND (6) | Key (11) | Pulse 3-5s to ground to switch state (initially off) |
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+
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+`Key` is tied to the power button on the FONA.
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+We want this to be permantly on without the need for
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+the Pi to turn it on or off, so this should be tied to ground (?).
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On the Raspberry Pi (RPi 3B+, Raspbian 2019-07-10 Buster)
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