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Palm Serial information


Palm Serial Connector
Type Communication, power supply
Production history
Designer Palm, Inc.
Superseded by Palm Universal Connector
General specifications
Pins 10
Pinout
Pin 1 DTR output nonstandard RS-232
Pin 2 +3.3 V VCC
Pin 3 RS-232 input, Signal T RxD RxD
Pin 4 RTS RS-232 output RTS
Pin 5 RS-232 output, Signal R TxD TxD
Pin 6 CTS RS-232 input CTS
Pin 7 HotSync IRQ - +3.3 V to press the HotSync button HOTSYNC
Pin 8 Peripheral id. The Palm modem connects this pin to pin 2 to 20 kOhms ID ID
Pin 9 is not connected. In the Palm III, 5 V DC output N/C
Pin 10 Signal Ground GND

The Palm Serial were 3 successive proprietary 10-pin Serial connectors on the bottom of the first 3 series of models of PDAs from Palm, Inc. to provide serial communications: 1) pre-IrDA models; 2) the 1st IrDA models; 3) the 1st thin, metal-body models. In addition to Palm's models (and rebranded models like the IBM WorkPad series) similar serial connectors have been used in the Ericsson MC16 Palmtop and Handera equipment. Pressing the HotSync button located at the base of the cradle closes a circuit between pins 2 and 7 which causes the activation of MUN2214 NPN transistor connected to pin 38 of the Motorola Dragonball CPU that provides a low signal on the IRQ1 UART, triggering the HotSync process. On pin 8 when a modem connects to the Palm similarly closes a circuit pin 2 to activate another MUN2214 NPN transistor connected to pin 32 (GPIO UART) of the CPU to notify the presence of the modem.

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