Intermec 073290-001 User Manual

 

Pin 1

10-pin Stewart 937-SP-301010R-K2
(View looking into connector)

 

The 072786 tethered scan flex assembly incorporates a MAX471 current 
sensor (U1) to detect when a tethered scanner is plugged in. This is 
intended as a piece of a scanner “Plug and Play” strategy, but is not 
implemented in the current software. Comparator U2 compares the 
current sensor output to a resistive divider reference, and drives its open-
drain output connected to the IMAGER_PIXCLK FPGA input: 

High-Z (float high)  =  no SCAN_5V current  =>  no scanner installed 
0V  =  ≥ 5mA SCAN_5V current  =>  scanner installed 

The TRIG_AIM* signal in this case is used to enable and disable the auto-
detect feature such that when disabled, the current sensor output is high-
Z, so it does not interfere with the IMAGER_PIXCLK signal alternate 
scanner function (BEEP). 

TRIG_AIM*  =  0  => auto-detect enabled 
TRIG_AIM*  =  1  => auto-detect disabled 

Since some scanners draw little or no current until the trigger is pulled, the 
auto-detect feature may not function until the scanner trigger is pulled. 
The auto-detect signal should be ignored during transitions (most often 
occurring on Suspend and Resume) when the current sensor changes state 
as SCAN_5V is enabled and disabled, possibly giving a false scanner 
detection. 

Inverter U3, driven by the SCAN_EN signal, is used to switch the DBP, 
SOS and Trigger pull-ups to pull-downs to aid in the scanner auto-ID 
process. This is useful for distinguishing newer decoded-output scanners 
from older legacy DBP-mode undecoded scanners. 

Decoded-output tethered scanners and undecoded (DBP) tethered 
scanners are also supported through 26-pin docking connector J13, mostly 
so that a tethered scanner can be left attached to a vehicle dock and 
become active when the CK30 is docked.