Add this to your batch file but of course change %Your_core_server% to your core server name :
set LDC=C:\Program Files\LANDesk\LDClient
set LDC64=C:\Program Files (x86)\LANDesk\LDClient
if %PROCESSOR_ARCHITECTURE% ==AMD64 (
ECHO RUN INVENTORY SCAN x64
CD "%LDC%"
LDISCN32.EXE /NTT=%Your_core_server%:5007 /S="%Your_core_server%" /I=HTTP://%Your_core_server%/ldlogon/ldappl3.ldz /NOUI /NOCD /F /SYNC
ECHO %ERRORLEVEL%
sdclient.exe /msg=Inventory64_ERRORLEVEL_is_%ERRORLEVEL%
) else (
ECHO RUN INVENTORY SCAN x32
CD "%LDC%"
LDISCN32.EXE /NTT=%Your_core_server%:5007 /S="%Your_core_server%" /I=HTTP://%Your_core_server%/ldlogon/ldappl3.ldz /NOUI /NOCD /F /SYNC
ECHO %ERRORLEVEL%
sdclient.exe /msg=Inventory_ERRORLEVEL_is_%ERRORLEVEL%
)