Intermec 073298-001 用户手册

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: 

0 X 

TETH_SOS functions as the tethered scanner 
SOS input into the FPGA. 

1 

0 

Tethered decoded scanner present. 

1 1 

No 

scanner 

present. 

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. 

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). 

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. 

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. 

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. 

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.