ELM327 USB is the latest PC-based scan tool. It supports all OBD-II 
protocols and is 
dispatched with a number of compatible programs. The processor is an ELM327 USB. The output 
protocol (connection to laptop) is USB. 
Processor: ELM327 USB

OBD-II Protocols: 
 ISO15765-4 (CAN) 
 ISO14230-4 (KWP2000) 
 ISO9141-2 
 J1850 VPW 
 J1850 PWM

Output protocol: RS232 
Baud rate: 9600 or 38400 
Indicator LEDs: OBD Tx/Rx, RS232 Tx/Rx, Power 
Operating voltage: 12V, internal protection from short circuits/overvoltages 
Nominal idle current: 45 mA

Description: 
OBD-II Software for ELM327 USB is a free program that allows you to use your PC and a hardware 
interface to get the information from your car's computer.

The program is very user-friendly, and easy to learn. It is also very easy to install: simply 
extract the files into a folder on your computer's hard drive, and you're ready to go. To 
uninstall the program, simply delete the entire contents of the folder where the program 
resides.

The software supports two platforms - DOS and Windows. 
  
The program lets you perform the following operations: 
 Read diagnostic trouble codes, both generic and manufacturer-specific, and display their 
meaning (over 3000 generic code definitions in the database). 
 Clear trouble codes and turn off the MIL ("Check Engine" light) 
 Display current sensor data, including: 
 Engine RPM 
 Calculated Load Value 
 Coolant Temperature 
 Fuel System Status 
 Vehicle Speed 
 Short Term Fuel Trim 
 Long Term Fuel Trim 
 Intake Manifold Pressure 
 Timing Advance 
 Intake Air Temperature 
 Air Flow Rate 
 Absolute Throttle Position 
 Oxygen sensor voltages/associated short term fuel trims 
 Fuel System status 
 Fuel Pressure 
 Many others... 
  
Upcoming Features: 
 Data graphing and logging 
 Freeze Frame data 
 Continuous and Non-Continuous Oxygen Sensor test results

Free software: 
Scantool.net 
 GM Mode 22 Scan Tool by Terry 
 OBD Gauge for PalmOS and Pocket PC by Dana Peters 
 OBD Logger by Jonathan Senkerik 
 OBD-II ScanMaster by Wladimir Gurskij (ScanMaster 3.52 - local copy) 
 obd2crazy.com 
 OBD2 Scantool by Ivan Andrewjeski 
 OBDII for ELM322 by David Huffman 
 pyOBD by Donour Sizemore for MacOSX and Linux 
 RDDTC by Pete Calinski 
 Real Scan by Brent Harris 
 ScanTest for Pocket PC by Ivan Ganev aka a-ser 
 wOBD by WDT