Hardware reference guide

Chapter 2: The Hardware
The Docking Port
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7535 Hardware Reference Guide
Available peripherals include chargers and a Portable Docking Module (PDM) that
provides connections for USB host port, USB client port, and a serial port. See “The
Portable Docking Module” on page 17 for details about the PDM.
Figure 2.3 The Docking Port
The docking port supplies DC power, a serial port, a USB host port, and a USB
client port.
Power
Power for charging the batteries and powering the terminal (9-24 V DC; 3.4 A max)
is supplied to the terminal through the docking port.
The terminal can supply 5V power (2 A max) to an external device through the
‘Power Output’ pins. This power is switched; the switch is controlled by the
Docking Port Services driver and is turned on only after the device is attached and a
valid Dock ID is detected.
Console Port
The console port uses a standard 3 wire serial interface (TxD, RxD, GND). Signals
levels are standard RS232 levels. This port is provided as a 9-pin D-connector on
the Portable Docking Module.
This console port is multiplexed between the main processor (the default) and the
peripheral controller. This console port is COM3 under Windows CE .NET.
USB Host Port
The USB host interface complies with USB specification 1.1 and provides a “high-
speed” connection to external devices and hubs. Power for external devices is pro-
vided through the docking port’s power output pins. The OHCI driver is in charge of
the USB Host interface.