ELM327LSM datasheet(70/94 Pages) ELM

70 / 94 page

ELM327L

70 of 94

ELM327L DSA

Elm Electronics – Circuits for the Hobbyist

www.elmelectronics.com

Programmable Parameters (continued)

rate, or the Carriage Return character, for example,

and forget what you have set them to. The Carriage

Return value that is set by PP 0D is the only character

that is recognized by the ELM327 as ending a

command, so if you change its value, you may not be

able to undo your change. In this case, your only

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

special 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

default settings. 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 an

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 flashing LED means that it worked

and the PPs are all off.

This feature should only be used when you get

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

putting a jumper into a live circuit might cause damage

if you put it into the wrong place). Be careful if you

need to use it.

Linefeed Character

00 to FF

Programmable Parameter Summary

The following pages provide a list of the currently

available Programmable Parameters. The character

shown in 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)

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)

Perform an AT MA command after powerup or reset

(OFF)

00 = ON

FF = OFF

(OFF)

00 = ON

FF = OFF

00 = ON

FF = OFF

Description

Values

Default

Type

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

00 to FF

00 to 02

Default Adaptive Timing mode (AT AT setting)

Last Protocol to try during automatic searches

01 to 0C

Character echo (AT E default setting)

(ON)

00 = ON

FF = OFF

ELM327LSM Datasheet(PDF) 70 Page - ELM Electronics

ELM327LSM Datasheet(HTML) 70 Page - ELM Electronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94

Datasheet Download

Link URL