ELM OBD Terminal

Tool for Android devices - Version 2.1.9

ELM OBD Terminal is an OBDII compatible app. It can communicate with and the vehicle ECU via adapter ELM327 (or compatiple) on base of Bluetooth or Wi-Fi platform

Connection settings

1. Bluetooth connection - select proper bluetooth device

2. WiFi connection - select correct IP address and port

Default values:

IP address : 192.168.0.11

port: 35000

Resources

1. Available list of AT commands

2. Available list of generic OBDII PIDs

Sending command:

The app can issue any ELM327 AT command or hexadecimal OBDII PIDs

1. By selecting from available list of AT commands (OBDII PIDs) and tapping the Button Send.

2. By directly typing the AT command (OBDII PIDs) and tapping the Button Send.

After sending the sent command (OBDII PID) is displayed on the screen with the icon of TX

Receiving Response

The respond is displayed in the screen with icon of RX.

Note

This app does not translate the responses from the car's ECU to human readable format.

So the user must translate them self these responses to readable format

Most of generic OBDII PIDs are fetched from available list have support formulas

Some AT command:

ATZ - reset all

AT WS - warm start

AT@1- display the device desription

AT@2 - display the device identifier

AT H1 - set headers on

AT H0 - set headers off

AT SP n - set protocol to n

AT DP - Describe the current protocol

AT AL - allow long (>7 byte) messages

AT AR - automatic receive

AT AT0 - adaptive timing off

AT AT1 - adaptive timing auto1

AT AT2 - adaptive timing ato2

AT BD - perform buffer dump

AT CAF0 - CAN auto format off

AT CAF1 - CAN auto format on

. . .

Some Generic OBDII PIDs (hexadecimal format without part of 0x)

03 - show stored diagnostic trouble codes

04 - clear stored trouble codes and stored values

07 - show pending trouble codes

0A - show permanent diagnostic trouble codes

0902 - VIN vehicle identification number

0904 - calibration ID

0100 - PIDs supported [1..20]

010C - engine RPM - rpm, formula: (256*A + B)/4

010D - vehicle speed - km/h, formula : A

. . .

If you do testing on command line terminal, there is an order to put AT commands as following :

ATZ - reset OBD-II adapter

ATSP6 - set protocol ISO 15765-4 CAN 11/500Kb (may use ATSP0 or ATTP6)

ATH1 - View the header 7E8 in the response or ATH0 if not

ATCAF1 -The adapter to format data for you

ATCAF0 - Do format the request data yourself. in this case remember to add PCI byte (number of data bytes) at the first place in the request

for example 02 01 0D : where 01 0D is request vehicle speed (2 data bytes) and PCI byte is 02

After init the OBD-II adapter ELM327 with the above AT commands, you can send what OBD-II request (or other config AT commands)

for example request vehicle speed after run AT config commands to use protocol ISO 15765-4 CAN 11/500Kb:

Send request: 010D

Receive respond: 7E803410D64

(Where CAN header: 7E8; 03 : number of byte in respond ; 410D request respond; 64 the speed in HEX)

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