This page outlines the expansion board connector pinouts for all verdex pro and legacy COMs.
Serial Connector
MiniDIN-8 connector diagram: 
Serial Null Modem Cable
| DB9 signal | DB9 | MiniDIN8 Signal | MiniDIN8 |
|---|---|---|---|
| RxD | 2 | 3 | TxD |
| TxD | 3 | 5 | RxD |
| RTS | 7 | 2 | CTS |
| CTS | 8 | 6 | RTS |
| GND | 5 | 4 | GND |
Serial Modem Cable
| DB9 signal | DB9 | MiniDIN8 | MiniDIN8 signal |
|---|---|---|---|
| RxD | 2 | 5 | RxD |
| TxD | 3 | 3 | TxD |
| RTS | 7 | 6 | RTS |
| CTS | 8 | 2 | CTS |
| GND | 5 | 4 |
GND |
UART
Note: Current kernels use ttyS3 (HWUART) for bluetooth. This is available on the BTUART pins by setting GPIO42 and 43 to AF3 - and this is the default configuration. This can be very confusing if you want to use the HWUART for something else! To re-enable HWUART on ttyS3, make bluetooth use ttyS1 (see /etc/default/bluetooth) and then set GPIO42 to AF1 in and GPIO43 to AF2 out. You can then set GPIO48 to AF1 out (HWUART TXD) and GPIO49 to AF1 in (HWUART RXD).
FFUART
| FF_CTS |
| FF_RTS |
| FF_TXD |
| FF_RXD |
- Logic level (3.3V) signals
- Speeds to 230 kbps
- Normally mapped to ttyS0 in the kernel and Y0 in some schematics
- FFUART pins are located on the 60-pin Hirose connector
- Schematic diagram for the FFUART
HWUART
| HW_CTS |
| HW_RTS |
| HW_TXD |
| HW_RXD |
- Logic level (3.3V) signals
- Speeds to 921 kbps
- Normally mapped to ttyS3 in the kernel and Y1 in some schematics
- HWUART pins are located on the 60-pin Hirose connector (connex and basix only)
- Schematic diagram for the HWUARt
STUART
- Logic level (3.3V) signals
- Speeds to 230 kbps
- Normally mapped to ttyS2
- Schematic diagram for the STUART
BTUART
| BT_CTS |
| BT_RTS |
| BT_TXD |
| BT_RXD |
| BT_NRESET | Bluetooth reset (output, active low) |
| CLK_32 | 32.768 kHz Clock output |
- Logic level (3.3V) signals
- BTUART pins are located on the 0-pin Hirose and 24-pin flex ribbon (verdex only) connectors.
- It is not an exposed interface; mapped to ttyS1 by the kernel and connected physically to the bluetooth module if one is present.
- BT_NRESET and CLK_32 are for an optional Bluetooth module IC (24-pin flex ribbon only)
NSSP
- Slave speeds to 13 Mbps
- Master speeds to 3.6864 Mbps
USB
- Version 1.1
- Requires one or two additional GPIO lines for presence or sleep detection
I2C
- The I2C unit supports a fast mode operation of 400 Kbits/sec and a standard mode of 100 Kbits/sec. Refer to I2C bus specification for details.
Note the I2C on the Gumstix page.
Batteries and power
Gumstix verdex pro motherboards require 3.4V min and max 5V. Using a power supply above 5v generates extra heat. Gumstix uses LDO voltage regulators, and have on-board generation of all voltages required so just plug in the power supply to any of the expansion board power input ports and go. This range covers Li-Ion, Li-polymer, NiMH (3-cells) or any other combination of reasonable unclean battery supplies that provide nominal output around 3.6 - 5.0 V.
