ELM327P datasheet(55/76 Pages) ELM

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Programmable Parameters (continued)

55 of 76

ELM327DSH

Elm Electronics – Circuits for the Hobbyist

www.elmelectronics.com

ELM327

recourse may be to force all of the PPs off with a

hardware trick.

When the ELM327 first powers up, it looks for a

jumper between pin 28 (the OBD Tx LED output) and

circuit common (VSS). If a jumper is in place, it will turn

off all of the PPs for you, restoring the IC to the factory

defaults. To use this feature, simply connect a jumper

to circuit common (which appears in numerous places

- pins 8 or 19 of the ELM327, pin 5 of the RS232

connector, one end of most capacitors, or at the OBD

connector), then hold the other end of the jumper to

pin 28 while turning the power on. When you see the

RS232 Rx LED begin to flash quickly, remove the

jumper – the PPs are off.

This feature should only be used when you get

into trouble too deeply, and it’s your only choice (since

putting jumpers into a live circuit might cause damage

if you put it into the wrong place). As well, it is only

available beginning with version 1.2 of the IC, and can

not be used with any previous versions.

OBD Source (Tester) Address. Not used for J1939 protocols.

Last Protocol to try during automatic searches

Description

Values

Default

Type

Printing of header bytes (AT H default setting)

Allow long messages (AT AL default setting)

NO DATA timeout time (AT ST default setting)

setting = value x 4.096 msec

00 to FF

(205 msec)

Character echo (AT E default setting)

Linefeed Character

Perform AT MA after powerup or reset

(OFF)

(ON)

00 = ON

FF = OFF

00 to FF

01 to 0C

00 to FF

(OFF)

00 to 02

Default Adaptive Timing mode (AT AT setting)

00 = ON

FF = OFF

00 = ON

FF = OFF

00 = ON

FF = OFF

Programmable Parameter Summary

The following pages provide a list of the currently

available Programmable Parameters. Note that the

‘Type’ column indicates when changes will take effect.

Possible values are:

I - the effect is Immediate,

D - takes effect after Defaults are restored

(AT D, AT Z, AT WS, MCLR or power off/on)

R - takes effect after a Reset

(AT Z, AT WS, MCLR or power off/on)

P - needs a Power off/on type reset

(AT Z, MCLR, or power off/on)

ELM327P Datasheet(PDF) 55 Page - ELM Electronics

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