SCR331-DI Product Technical Manual
3.2 Hardware Specifics
3.2.1 Adapter Power
High Bus Powered (>100 mA and <500mA) (draws power from the USB bus), for USB
operation
3.2.2 LED Behavior
By default, the RF Field is switched off when a contact card is present in the contact slot. However the
firmware can be configured before loading to the device (not in run time) so that the RF Field is ON
even in presence of CONTACT card in the CONTACT slot. The LED behavior for both the firmware
configurations is given below. For details about the two different driver architectures (single/dual)
please see chapter 4.2.
SCR331-DI Firmware Ver 6.18; Driver Ver 4.30.00.01; PCB Rev 1.4
SCR331-DI DUAL SLOT FIRMWARE LED STATUS
LED States
LED1 (GREEN)
LED2 (RED)
Just after plug-in (with drivers
already installed)
ON
OFF
Just after DFU operation
ON
OFF
Suspend / standby
OFF
OFF
Reader powered, Contact card IN,
but not powered (98/ME - issue
power down using the
Testresman utility)
500ms ON
500ms OFF
OFF
Reader powered, Contact card IN,
but not powered (2K/XP - power
down takes place )
ON
OFF
ICC Powered / Communication
500ms ON
500ms OFF
OFF
PICC Powered / Communication
500ms ON
500ms OFF
OFF
Reader / card errors
OFF
100ms ON
100ms OFF
Firmware upgrade running
OFF
ON
COMBI CARD powered in contact
slot
500ms ON
500ms OFF
OFF
COMBI CARD powered using RF
field
ON
ON
IND.SCR331-DI.MANUAL.VER.1.8
VER1.8
Page 6 of 36
