The Palm Serial Connector used before 2000/2001.
|1||DTR||non-standart implementation of DTR. As long as the transceiver is enabled this pin outputs an asserted signal. 3.0 volts when transceiver shutdown (normal mode), 6.0 volts when transceiver enabled (Hotsync)|
|2||Vbat, +3.3v||normally connected to HotSync (pin 7) with button|
|7||HotSync IRQ||link to 3.3v (pin 2) for HotSync. Interrupt line for waking up device (initiate HotSync process in PalmOS).|
|8||ID||Palm modem connect this pin to 3.3v (pin 2) by 20Kohm link|
|9||N/C*||DC In in Palm III (+5VDC)|
*Palm V does not contain an internal charging circuit.
Maximum transmission rate is 115200 bps (57600 bps for modem).
Here is Palm Serial cable scheme