Palm Universal connector
Pin Signal Description
1 GND Signal- and charge ground (connected to pin 7)   [ GPS Ground ]
2 USB_D+ Positive USB data signal [U1 green wire]
3 USB_D- Negative USB data signal [U2 white wire]
4 VBUS VBUS signal [U3 small red wire]
5 HOTSYNC HotSync IRQ - +3.3V for button push (via pin 9)
6 N/C Not Connected
7 GND Signal- and charge GND (connected to pin 1) [U4 small black wire]
8 ID

Identification for peripherials, resistor [R202=Zero Ohm] to ground. Should be short: USB cradle, 7.5 KOhm: Serial cradle, 20 KOhm: Mfg. Test Cradle, 47 KOhm: USB peripheral, 100 KOhm: Serial peripheral, 220 KOhm: modem

If pin 8 is shorted to ground, it forces USB mode. If left open, it forces Serial mode.

9 Vout +3.2V supply output, 100mA max.
10 RxD RS-232 RxD signal (input),  [GPS TX ] [D1]
11 TxD RS-232 TxD signal (output), [ GPS RX  ] [D2]
12 DETECT peripheral detect - tied to ground by peripherals [D3]
13 CTS RS-232 CTS signal (input) [D4]
14 RTS RS-232 RTS signal (output) [D5]
15 DTR RS-232 DTR signal (output) [D6]
16 CHARGE +5V charge supply input, 500-700mA

Palm USB cable:


Palm Universal connector (Tungsten T1, T2, T3, etc) has RS232 signals at RS-232 compatible levels, no voltage level translator from TTL to RS232 is needed. You can connect signals from your Palm Universal connect directly to PC or other compatible serial device.

PC-Palm synchronization cable pinout:


Connector board === PALM UNI  ===  PC DB9 Female
D2 ------- 11 (TxD) ------- 2 (RxD)
D1 ------- 10 (RxD) ------- 3 (TxD)
SH1/2 ----  1 (GND) ------- 5 (GND)
D6 ------- 15 (DTR) ------- 6 (DSR)
D4 ------- 13 (CTS) ------- 7 (RTS)
D5 ------- 14 (RTS) ------- 8 (CTS)
ID1 ------  8 (DEV-ID)             
E1/P1 ----  1 (PWR GND)            
E2/P2 ---- 16 (PWR V+)             

Pins 1, 7, and 12 should be shorted.  Pin 8 should be tied to the other three via a tiny 7.5k resistor or left open.  You may also want to bring out the two wires for the +5vdc charging connection, as well as tie pins 5 and 9 to a miniture push-button to initiate hot-sync.


Palm USB Cradle:  USB to Serial Mod:

16 pin PALM proprietary of PalmOne Tungsten T3, T, T2, C, W, Zire 71,  m125, m130, m500, m505, m515, i705 connector connector layout
16 pin PALM proprietary connector
at the PDA
4 pin USB A plug connector layout
4 pin USB A plug connector
at the usb cable
According to 14 reports in our database (10 positive and 1 negative) this pinout should be correct.

Is this pinout
Source(s) of this and additional information:,
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