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On Board Diagnostics (OBD) ICsDetailed description

On Board Diagnostics (OBD) ICs

Our "OBD Interpreter" ICs are designed for use with vehicles that use the standard OBDII (On Board Diagnostics) protocols. Most modern vehicles use the CAN (ISO15765-4) protocol, but yours may not. If you are unsure of what protocol your vehicle uses, see the obd help section.

OBD Interpreters

ELM320 - OBD (PWM) to RS232 Interpreter

ELM322 - OBD (VPW) to RS232 Interpreter

ELM323 - OBD (ISO) to RS232 Interpreter

ELM325 - J1708 Interpreter

ELM327

- version history

- OBD to RS232 Interpreter - version 1.3a

- OBD to RS232 Interpreter - version 1.4b

- OBD to RS232 Interpreter - version 2.1

ELM327L - low voltage version of the ELM327

ELM329 - CAN Interpreter

OBD Software Development

ELM328 - OBD Device Identifier Test IC



Our ELM327 is the only product that supports all of the standard OBDII protocols, but you may not need that many. To help you decide which chip to buy, we offer the following chart:

 
  SAE J1850-PWMX   X  
  SAE J1850-VPW X  X  
  ISO 9141-2  X X  
  ISO 14230-4 (slow)  X X  
  ISO 14230-4 (fast)  X X  
  ISO 15765-4 (CAN)    X X
  SAE J2411 (SWCAN)    X X
  KW1281 (SAE J2818)       
  SAE J1939 (250kbps)     X X
  SAE J1939 (500kbps)    X X
  SAE J1708 (J1587)   X   
  SAE J1708 (J1922)   X   

Note that we have also included a couple of non-OBDII protocols that we are often asked about.

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