Intermec 073292-001 ユーザーズマニュアル
Chapter 4 — Theory of Operation
The TETH_SOS pin on 26-pin docking connector J13 is used in
conjunction with TETH_PRESENT to indicate when a decoded tethered
scanner is plugged into the docking connector:
conjunction with TETH_PRESENT to indicate when a decoded tethered
scanner is plugged into the docking connector:
TETH_PRESENT
TETH_SOS
Description
0 X
TETH_SOS functions as the tethered scanner
SOS input into the FPGA.
SOS input into the FPGA.
1
0
Tethered decoded scanner present.
1 1
No
scanner
present.
Trigger and Scanner Control
Since the keypad Scan button and the handle trigger are handled as keys in
the scanned key matrix (see “Keypad” on page 67), the trigger signal to
internal scanners is a “soft” signal generated by the trigger driver in
response to a named event from the keypad driver, or under application
control. There is no direct connection between the trigger buttons and the
scanner.
the scanned key matrix (see “Keypad” on page 67), the trigger signal to
internal scanners is a “soft” signal generated by the trigger driver in
response to a named event from the keypad driver, or under application
control. There is no direct connection between the trigger buttons and the
scanner.
Tethered scanners, though, may have actual trigger signals. These are
sensed through FPGA inputs SCAN_TRIG* (for tethered scanners on the
10-pin port) and DOCK_TRIG* (for scanners brought in through 26-pin
dock port J13). In addition, when the system is suspended (PWR_EN is
low) and scanner power is configured to be left on, the SCAN_TRIG* and
DOCK_TRIG* signals can generate a system wakeup interrupt through
PXA255 GPIO1 (See “Resume Events” on page 65).
sensed through FPGA inputs SCAN_TRIG* (for tethered scanners on the
10-pin port) and DOCK_TRIG* (for scanners brought in through 26-pin
dock port J13). In addition, when the system is suspended (PWR_EN is
low) and scanner power is configured to be left on, the SCAN_TRIG* and
DOCK_TRIG* signals can generate a system wakeup interrupt through
PXA255 GPIO1 (See “Resume Events” on page 65).
The SCAN_TRIG* and DOCK_TRIG* signals can also be driven by
software as open-drain outputs from the FPGA to an external tethered
scanner, but this is not implemented in the current software.
software as open-drain outputs from the FPGA to an external tethered
scanner, but this is not implemented in the current software.
Scanning and Good Read Indication
The green Good Read indicator above the LCD display is controlled by
software through a register in the FPGA, which drives LEDs D3 and D23
through NPN Q5. Software sets the LED intensity high by driving
SCAN_LED_LOW low through the same FPGA register, bypassing LED
current-limiting resistor R133.
software through a register in the FPGA, which drives LEDs D3 and D23
through NPN Q5. Software sets the LED intensity high by driving
SCAN_LED_LOW low through the same FPGA register, bypassing LED
current-limiting resistor R133.
The Scanning/Good-read indicator on a tethered scanner is driven
separately – either by the scanner itself or through the
SPEED_RANGE_GDRD signal from the FPGA.
separately – either by the scanner itself or through the
SPEED_RANGE_GDRD signal from the FPGA.
Dock Interface
The CK30 uses a 26-pin JAE docking connector in the base of the
computer to provide RS-232, USB, Ethernet (batch option only), and
scanner interfaces.
computer to provide RS-232, USB, Ethernet (batch option only), and
scanner interfaces.
CK30 Handheld Computer Service Manual
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