Chapter 7: Docking Stations
Docking Station Expansion Module (X-Mod) Connector
110
Psion Teklogix Omnii HDK User Manual
7.2.4
Docking Station Expansion Module (X-Mod) Connector
Theory of Operation
The ST4002 and ST4003 desktop docking stations have an expansion module (X-Mod) connector
concealed under a plate in the bottom of the unit. In the ST4003 model, this connector is occupied
by an expansion module that provides the RS-232 and Ethernet ports. This module can be
removed and replaced with a custom expansion module if desired, but typically it is more sensible
to simply add the custom module to the ST4002 model.
A custom-built expansion module installed in the X-Mod connector should have an 845R resistor
connected to pin 20 on the header. This identifies the expansion module as a developer-created
device to the hand-held computer.
X-Mod Connector Details
For details on the X-Mod connector socket, and the specifications for designing a matching
header, see the files
114-24004-2011 2x10 connector on Xmod PCA (header).pdf
and
124-21022-
201 2x10 connector on Main PCA (socket).pdf
, included with the HDK.
Pinout
The 20-pin X-Mod connector has the following pinout:
Table 7.5 Pinout of 20-pin X-Mod Connector
Pin
Signal
Function
I/O Type Voltage
(V ±5%)
1, 4, 5, 8,
9, 11, 12,
15, 16, 19
Digital Ground
Ground
Ground
2, 3
VIN_12V
Power. 500 mA maximum
Power
12.0
6, 7
VDD_5V
Power. Turned on when the hand-held compu-
ter is connected. 500 mA maximum
Power
5.0
10
VDDChargeMicro
Power. Reference voltage. 10 mA maximum
Power
3.3
13
USB_H1_D-
USB Host port 1 D-
I/O
14
U
USB Host port 1 D+
I/O
17
USB_H2_D-
USB Host port 2 D-
I/O
18
U
USB Host port 2 D+
I/O
20
XModDetect
Connect to ground through 845R resistor on
expansion module PCB assembly. Identifies
module as custom-built to hand-held computer.
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