ELM327LP datasheet(73/94 Pages) ELM

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ELM327L

ELM327L DSA

Elm Electronics – Circuits for the Hobbyist

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Programmable Parameter Summary (continued)

Default ISO/KWP baud rate (AT IB default setting)

Note: 4800 baud can not be a default - set it with AT IB 48

(10.4K)

ISO/KWP wakeup message rate (AT SW default setting)

setting (in msec) = (PP 17 value) x 20.48

CAN auto formatting (AT CAF default setting)

CAN filler byte (used to pad out messages)

ISO/KWP delay before a fast init, if a slow init has taken place

setting (in msec) = 1000 + (PP 18 value) x 20.48

(2.0 sec)

CAN auto flow control (AT CFC default setting)

(3.0 sec)

(ON)

Description

Values

Default

Type

00 to FF

00 = 96

FF = 10

00 = ON

FF = OFF

00 = ON

FF = OFF

(2.0 sec)

00 to FF

Default CAN Silent Monitoring setting (for AT CSM)

(ON)

FF = ON

00 = OFF

Protocol 5 fast initiation active time (TiniL)

setting (in msec) = (PP 1A value) x 2.5

(25 msec)

00 to FF

ISO/KWP outputs used for initiation (b7 to b2 are not used)

b1: L line (pin 22)

0: disabled

1: enabled

b0: K line (pin 21)

0: disabled

1: enabled

If disabled, an output will remain low during protocol initiations

00 to FF

ISO/KWP P3 time (delay before sending requests)

Ave time (in msec) = (PP 1D value - 0.5) x 4.096

(59 msec)

00 to FF

Protocol 5 fast initiation passive time (TiniH)

setting (in msec) = (PP 1B value) x 2.5

(25 msec)

00 to FF

(00000011)

ISO/KWP K line minimum quiet time before an init can begin (W5)

setting (in msec) = (PP 1E value) x 4.096

(303 msec)

00 to FF

ISO/KWP delay before a slow init, if a fast init has taken place

setting (in msec) = 1000 + (PP 19 value) x 20.48

(11111111)

00 to FF

CAN Filter settings (controls CAN sends while searching)

The bits of this byte control options, as follows:

b7: 500 kbps match

0: ignored

1: required

b6: 250 kbps match

0: ignored

1: required

b5 to b1: reserved for future - leave set to 1

b0: send if bus is quiet

0: not allowed 1: allowed

Printing of the CAN data length (DLC) when printing header bytes

(AT D0/D1 default setting)

(OFF)

00 = ON

FF = OFF

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