A smaller, low-power microcontroller, the “peripheral controller”, is used to control and monitor many aspects of the hardware, including controlling system power, communicating with the smart battery pack, handling communications with the keyboard controller, collecting raw non-decoded scanner input, monitoring temperature, light, and other sensors.

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Chapter 2: The Hardware

Identifying Hardware

There are also two PIC microcontrollers; one scans the matrix keyboard and controls the LEDs, and the other drives the keyboard backlight.

2.2 Identifying Hardware

The 7535’s hardware configuration is listed in the information provided by the

System Properties applet in the Control Panel.

To reach this manually:

1. Press Blue + 0 to open the start menu.

2. Select Settings, Control Panel. The Control Panel opens.

3. Double-click on the System icon. The System Properties window opens.

4. Click on the Properties tab. System Properties lists the hardware and software in the 7535.

Listed items include:

• Date codes for the 7535’s boot software (‘Boot code’), peripheral-controller code (‘PCon code’) and OS software (‘WinCE code’).

• Processor type and speed.

• Amount of RAM and flash memory.

• Type and orientation of display.

• Presence and type of touch screen.

• Presence and type of scanner.

• Type of keyboard.

• Presence of heater.

• Serial number of main logic board (‘MLB Serial’).

• Serial number of device.

• Presence and type of card in internal PCMCIA and Compact Flash slots

(‘PCM/CF Slots-’).

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Chapter 2: The Hardware

The Scanner

2.3 The Scanner

The 7535 can support the following scanners, internal or external:

• 1D scanner

• PDF 417 2D scanner

• image scanner

Only one scanner is installed in the 7535, but a second handheld scanner can be connected via the tether port.

Internal scanners can be triggered from the trigger switch on the 7535’s handgrip (if present) or from the Scan button on the 7535’s keyboard. External scanners can only be triggered from their own trigger switch.

2.3.1 Scanner Control Services

This top level service (SCS) is responsible for supporting a variety of Physical Scan

Drivers (PSD), and presenting an API to applications. It receives decoded scan data from the drivers, performs any configured translations, and delivers the data to the appropriate application(s).

2.3.2 Non-decoded Laser Scanners

These scanners present raw data to the terminal. Internal and external non-decoded laser scanners are controlled by the main processor. Activation of the scanner trigger(s) or the keyboard scan button(s) causes the main processor to initiate a scan with the appropriate scanner. The peripheral controller acquires the raw scanner data and feeds it to the main processor.

The non-decoded scan driver is responsible for receiving this data from the peripheral controller and decoding it before passing it to the Scan Control Service, which performs any configured translations and delivers the data to the appropriate application(s).

2.3.3 Decoded Laser Scanners

These scanners process their raw data themselves, presenting formatted data to the terminal. Both 1D and 2D decoded laser scanners are supported by the 7535. The scanners will be connected to one of the serial ports and controlled by the main pro-

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Chapter 2: The Hardware

Imaging Scanners cessor. Activation of the scanner trigger(s) or the keyboard scan button(s) will initiate a scan with the appropriate scanner. The decoded scan driver is responsible for receiving scan data and passing it to the Scan Control Service.

2.3.4 Imaging Scanners

The 7535 can support an imaging scanner; both internal and external imaging scanners are supported. Psion Teklogix provides a driver for this scanner.

2.4 The Display

The 7535 is available with a 240x320-pixel display, either monochrome (64 shades of grey) or colour (256k colours). The contrast of the display can be adjusted from the keyboard via hot-keys, and is automatically temperature-compensated.

2.4.1 Touch Input

Touch input is an option for the 7535’s display. The touch driver controls the hardware directly to receive touch-down, touch-up, and movement events. Touch events are passed to the application via the operating system.

2.4.2 The Display Backlight

The 7535 has a backlight behind its display. This backlight can be adjusted for intensity, and can be configured to turn on when the ambient light level drops below a configured value.

2.5 The Keyboard

The 7535 has two types of available keyboard layouts. One type has 58 keys; the other has 36 keys.

Windows CE .NET returns ‘virtual key codes’ for keypresses. Psion Teklogix’ keyboard drivers take into account when Psion Teklogix’ own special modifier keys

(such as the Blue or Orange key) are pressed; the keyboard driver provides the virtual key code of the modified key.

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Chapter 2: The Hardware

The Keyboard Backlight

2.5.1 The Keyboard Backlight

The 7535 has a backlight behind its keyboard. This backlight can only be turned off and on, not adjusted for brightness, but it can be configured to turn on when the ambient light level drops below a configured value.

2.6 The LEDs

The 7535 has four tri-coloured indicator LEDs.

Radio LED

Scan LED

User Application

LED

Charge LED

Figure 2.2 Indicator LEDs

2.6.1 Charge LED

The lower-right LED is reserved for internal charger/power status. This indicator is active even when the 7535 is inserted in a docking station (and in suspend mode) so that the charge status of the battery can be detected easily.

Function Charge LED Behaviour

External power not available.

Fully charged to within 95% of charge capacity.

LED off.

LED displays solid green colour.

Quick charge successfully completed to within 75% of charge capacity.

Charge in progress.

LED flashes slow green.

LED displays solid yellow colour.

Cell temperature out of range for charge.

LED flashes yellow.

Unable to charge battery.

LED displays solid red colour.

Charge circuit failure.

LED flashes fast red.

Table 2.1 Charge LEDs

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Chapter 2: The Hardware

Radio Traffic LED

2.6.2 Radio Traffic LED

The upper-left LED on the 7535 flashes either orange or green to indicate when the radio transmits and receives data.

Note: While the standard 802.11b radio available for the 7535 supports the transmit/receive LED, not all radios support this function.

Function

Radio Transmit

Radio Receive

Radio Traffic LED Behaviour

LED flashes orange.

LED flashes green.

Table 2.2 Transmit and Receive LEDs

2.6.3 Scan LED

Successful scans are indicated in two ways – with a scan LED and with an audio tone.

Function

Scan in progress

Successful scan

Unsuccessful scan

Scan LED Behaviour

LED displays solid red during scan.

LED displays solid green after decode.

Off when scan ended.

LED flashes red.

Table 2.3 Scan LED

2.6.4 User Application LED

This indicator is available for custom applications. Neither the 7535’s operating system nor Psion Teklogix’ terminal-emulator TekTerm use this LED.

2.7 The Beeper

The 7535 has an internal beeper whose volume can be manually adjusted via keyboard hot-keys.

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Chapter 2: The Hardware

Accessory Cards

2.8 Accessory Cards

The 7535 can accept accessory cards, which fit into internal slots in the unit. The

7535 has two slots which accept the following types of accessory cards:

• Compact Flash (CF) cards.

• MultiMedia Cards (MMCs).

• Secure Digital (SD) cards.

These cards can contain additional memory, or other accessories. The Compact

Flash slot is normally occupied by a radio.

Typically, 7535 hand-helds are configured at the factory and arrive ready for use.

The 7535’s accessory-card slots are not intended for user modification.

If a device needs to be changed or added in these slots, contact qualified Psion Teklogix personnel. Refer to Appendix A: Support Services And Worldwide Offices for the service number closest to you.

2.9 Ports

The 7535 itself has the following connectors:

• Docking port.

Connects to chargers and docking modules.

• Tether port.

Connects scanners and other cabled peripherals.

2.9.1 The Docking Port

The docking port allows the terminal to be placed in a cradle that allows battery charging and connection to peripherals.

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Chapter 2: The Hardware

The Docking Port

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 “highspeed” connection to external devices and hubs. Power for external devices is provided through the docking port’s power output pins. The OHCI driver is in charge of the USB Host interface.

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Chapter 2: The Hardware

The Tether Port

USB Client Port

The docking port provides a USB client interface to connect the 7535 to a USB host computer or hub. The 7535 acts as a USB serial device via the USB client port. On the 7535, this serial device is COM4. The 7535 also can act as a USB client (a Mass

Storage Device), when its bootloader is running, to allow software updates via USB.

Dock ID

By reading a resistance value, the 7535 can identify the device attached to the docking port. The Docking Services driver reads the ID, identifying the device, checks the registry to see which driver to load, then loads the appropriate driver.

2.9.2 The Tether Port

The Tether Port

Figure 2.4 The Tether Port

The tether port allows an external non-decoded scanner, a serial scanner, or a USB client device to be connected to the terminal through a single connector. Generic serial devices, such as printers, GPS receivers, and other serial devices, are also supported.

The tether port is COM1.

The 7535’s peripheral controller identifies connected devices by sensing a resistor within the cable of the connected device. It notifies a driver running on the main processor that a device has been connected. This driver then looks for an appropriate driver to load, and instructs the peripheral controller to configure the port appropriately and enable power to the port.

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Chapter 2: The Hardware

COM Ports On The 7535

See “Section 2.14.2 The Tether Port” on page 19 for details of the devices that can

connect to the tether port.

2.9.3 COM Ports On The 7535

The 7535 has the following COM ports:

COM Port

COM1

COM2

COM3

COM4

Tether port

Reserved (internal use only)

Console port

USB port

Use

2.10 Power Management

The 7535 is powered by a lithium-ion rechargeable battery pack. The 7535 can be powered from external power when used with the AC adaptor. When the 7535 is powered from the AC adaptor, it will also charge the battery pack.

An internal supercapacitor will hold charge for ten minutes to preserve the contents of RAM while the 7535’s battery is being changed.

2.11 Turning The 7535 On And Off

To switch on: press and hold the Enter/On key for at least one second.

To switch off: press the Blue key, then press the Enter/On key. The 7535 enters a suspended state. The contents of RAM are preserved.

2.12 Resetting The 7535

The 7535 hardware can be reset in two different ways. The first way restarts the operating system. The second way does not load the operating system, but presents the boot loader. The boot loader can load the operating system. It has a text-mode console at which commands can be entered.

To reset the 7535 and restart the operating system:

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Chapter 2: The Hardware

The Portable Docking Module

• Press and hold down the Blue key and the Enter/On key simultaneously for a minimum of six seconds. The four indicator LEDs light for a second, and the screen displays the Psion Teklogix and Microsoft® Windows®

CE.net splash screen before displaying the startup desktop.

To reset the 7535 and display the boot loader:

• Press and hold down the Scan key, the Blue key and the Enter/On key simultaneously for a minimum of six seconds. The four indicator LEDs light for a second, and the 7535 displays the boot-loader’s opening screen.

A reset results in a complete reboot of the unit. All RAM memory contents are lost.

The contents of the flash memory and memory card are preserved.

2.13 The Portable Docking Module

The 7535 can be connected to a Portable Docking Module (PDM):

USB Type-B (Client) Port

Docking Port

Serial Port

USB Type-A (Host) Port

DC Power Connector

The Portable Docking Module provides serial and USB ports.

The PDM has the following ports:

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Chapter 2: The Hardware

The Portable Docking Module

• Serial port.

This 9-pin D-connector accepts a null-modem serial cable to connect to the development machine.

• USB type B port.

This port accepts a cable from a USB host (typically the development computer). It can be used for OS image updates, ActiveSync connections and application debugging.

• USB type A port.

This port connects the 7535 to other devices; the 7535 serves as a USB host.

This port can be used to connect a USB mouse and keyboard.

• Docking port.

This port connects to the 7535.

• DC power connector.

Accepts 15 V DC from the AC adaptor.

The Portable Docking Module is available as part of a kit from Psion Teklogix. This kit, Psion Teklogix part number 1030085, includes the following items:

• The Portable Docking Module (part number 1030083)

• A USB A-B cable (part number 9003322)

• A null modem cable (part number 9003659)

• A DC power adapter (part number 9003323)

• A power cord.

North American power cord: part number A2032 0036 0001

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Chapter 2: The Hardware

Pinouts And Cables

2.14 Pinouts And Cables

2.14.1 The Serial Port

The RS232 serial port on the 7535’s Portable Docking Module has the standard 9pin pinout; however, the PDM only passes the TxD, RxD, and Ground signals to the

7535’s docking connector. There is no hardware flow control.

The serial cable supplied is a 9-pin-to-9-pin null-modem cable, Psion Teklogix part number 9003659.

The pinout of a standard 9-pin RS-232 connector is as follows:

Pin Function

DCD

RXD

TXD

DTR

Ground

DSR

RTS

CTS

Table 2.4 RS232 Pinout

2.14.2 The Tether Port

The 7535 can recognize several types of devices connected to its tether port. These devices are as follows:

• USB device.

• serially-connected RFID reader.

• generic serial device.

• non-decoded scanner.

• decoded serial scanner.

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Chapter 2: The Hardware

The Tether Port

• Psion Teklogix ScanSee, a scanner and input device which can be worn on the back of the hand.

The tether port on the 7535 accepts an eight-pin custom connector:

Figure 2.5 Tether Port Connector

A mating connector is available from Psion Teklogix with part number 1020060.

The 7535 distinguishes between devices connected to the tether port by reading the resistance between pin 8 and pin 5 of the tether port. These resistance values are as follows:

Tether ID

Resistor Value (Ohm)

150k

59k

34.8k

23.2k

16.2k

11.8k

8.66k

6.34k

4.53k

3.01k

1.82k

825

Connected Device

USB

Serially-connected RFID device

Generic serial device

Non-decoded scanner

Decoded serial scanner

Psion Teklogix ScanSee

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Chapter 2: The Hardware

The Tether Port

Table 2.5 Recognized Tether Port Resistance Values

Devices that connect to the tether port may be wired as follows:

USB Device

Tether Connector Pin

Pin Description

VCC (+5 V from 7535)

USB+

USB-

GND

150k Ohm Resistor

(Connect the other end of resistor to pin 5)

Table 2.6 Tether Connector Pinout For USB Device

PowerScan Non-decoded Scanner

Tether Connector Pin

Description

SCN_TRIG (TRIGGER)

VCC (+5 V from 7535)

SOS (SOS)

SCN_DATA (BAR_OUT)

GND (GND and CONFIG2)

SCAN_ENABLE (PWR_ENABLE)

SCN_ACK (GOOD READ)

8.66k Ohm Resistor

(Connect the other end of resistor to pin 5)

Table 2.7 Tether Connector Pinout For PowerScan Non-decoded Scanner

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Chapter 2: The Hardware

The Tether Port

Symbol P300STD Non-decoded Scanner

Tether Connector Pin

Description

SCN_TRIG (TRIGGER)

VCC (+5V from 7535)

SOS (SOS)

SCN_DATA (DEP)

GND (GND)

SCAN_ENABLE (ENABLE)

SCN_ACK (DECODE)

8.66k Ohm Resistor

(Connect the other end of resistor to pin 5)

Table 2.8 Tether Connector Pinout For Symbol P300STD Non-decoded Scanner

PowerScan Decoded Scanner

Tether Connector Pin

Description

RXD (to 7535)

VCC (+5 V from 7535)

TXD (from 7535)

GND

4.53k Ohm Resistor

(connect the other end of resistor to pin 5)

Table 2.9 Tether Connector Pinout For PowerScan Decoded Scanner

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Chapter 2: The Hardware

The Tether Port

Symbol P304PRO Decoded Scanner

Tether Connector Pin

Description

RXD (to 7535)

VCC (+5 V from 7535)

TXD (from 7535)

GND

4.53k Ohm Resistor

(connect the other end of resistor to pin 5)

Table 2.10 Tether Connector Pinout For Symbol P304PRO Decoded Scanner

Generic Serial Device

Tether Connector Pin

Pin Description

RXD (to 7535)

CTS (to 7535)

TXD (from 7535)

GND

RTS (from 7535)

16.2k Ohm Resistor

(Connect the other end of resistor to pin 5)

Table 2.11 Tether Connector Pinout For Generic Serial Device

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Chapter 2: The Hardware

The Docking Port

ScanSee

Tether Connector Pin

Pin Description

RXD (to 7535)

VCC (+5V from 7535)

TXD (from 7535)

GND

1.82k Ohm Resistor

(Connect the other end of resistor to pin 5)

Pin On ScanSee

Table 2.12 Tether Connector Pinout For ScanSee

2.14.3 The Docking Port

The docking port on the 7535 can connect to the following devices:

• Portable Docking Module

• Powered Cradle

• Port Replicator

• Combo Charger And Dock

• Quad Dock

The docking port has the following pinout:.

Pin 2 Pin 12

Pin 1 Pin 11

Figure 2.6 Docking Port Connector

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Chapter 2: The Hardware

The Docking Port

Pin Number Purpose

EXT_5V

RXD

TXD

PWR_IN

USB Host -

USB Host +

PWR_IN

DOCK_ID

Notes

Switched 5V DC from 7535 (2 A max)

RS232 RxD (7535 console port)

RS232 TxD (7535 console port)

DC input to 7535 (9-20 V DC; 3.4 A max)

USB host data - (to USB peripherals)

USB host data + (to USB peripherals)

DC input to 7535 (9-20 V DC; 3.4 A max)

The resistance between this pin and ground identifies the device to which the terminal is connected.

GROUND

USB_D-

USB_D+

GROUND

USB Client Data - (from USB host)

USB Client Data + (from USB host)

Table 2.13 Docking Port Pinout

The 7535 distinguishes between devices on the docking port by reading the resistance between pin 8 and ground on the docking port. These resistance values are as follows: