ELM327LSM datasheet(74/94 Pages) ELM

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ELM327L

ELM327L DSA

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Programmable Parameter Summary (continued)

(10000000)

(50 Kbps)

Protocol B (USER1) baud rate divisor. See PP 2B for a description.

00 to FF

(11100000)

(125 Kbps)

01 to 40

00 to FF

Protocol C (USER2) CAN options. See PP 2C for a description.

Protocol C (USER2) baud rate divisor. See PP 2B for a description.

01 to 40

Protocol B (USER1) CAN options.

Each bit of this byte controls an option, as follows:

b7: Transmit ID Length

0: 29 bit ID

1: 11 bit ID

b6: Data Length

0: fixed 8 byte 1: variable DLC

b5: Receive ID Length

0: as set by b7 1: both 11 and 29 bit

b4: baud rate multiplier

0: x1

1: x 8/7 (see note 3)

b3: reserved for future - leave set at 0.

b2, b1, and b0 determine the data formatting options:

Data Format

none

ISO 15765-4

SAE J1939

Other combinations are reserved for future updates – results will

be unpredictable if you should select one of them.

(250 Kbps)

01 to 40

Protocol A (SAE J1939) CAN baud rate divisor

baud rate (in kbps) = 500 ÷ (PP 2B value)

For example, setting this PP to 19 (ie. decimal 25) provides

a baud rate of 500/25 = 20 kbps.

(00111100)

00 to FF

CAN Error Checking (applies to protocols 6 to C)

Each bit of this byte controls an option, as follows:

b7: ISO15765 Data Length

0: accept any

1: must be 8 bytes

b6: ISO15765 PCI = 00

0: allowed

1: not allowed

b5: Search after ERR94

0: normal

1: CAN is blocked

b4: Search after LV RESET

0: normal

1: CAN is blocked

b3: Wiring Test

0: bypass

1: perform

Processing 7F xx 78’s:

b2: enabled (CAN & KWP)

0: no

1: yes

b1: valid Modes (xx values)

0: all

1: only 00 to 0F

b0: valid CAN protocols

0: all

1: only ISO15765

Notes:

1. The ELM327 does not accept decimal digits for the Programmable Parameters - all values are hexadecimal.

2. For Programmable Parameters that describe options in terms of bits, b7 is the msb, and b0 is the lsb.

3. When b4 of PP 2C or PP 2E are set, the CAN baud rate will be increased by a factor of 8/7, but the baud

rate displayed by the AT DP command will still show the base rate (as set by PP 2D or PP 2F). For example,

if you set PP 2C b4 to 1, and then PP 2D to 06, the base frequency will be 83.3 kbps. The AT DP command

will report 83 kbps, but the actual baud rate will be 83.3x8/7 = 95.2 kbps.

Description

Values

Default

Type

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