ELM327LSM datasheet(71/94 Pages) ELM

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ELM327L

ELM327L DSA

Elm Electronics – Circuits for the Hobbyist

www.elmelectronics.com

Programmable Parameter Summary (continued)

RS232 baud rate divisor

baud rate (in kbps) = 4000 ÷ (PP 0C value)

For example, 500 kbps requires a setting of 08 (since 4000/8 = 500)

Here are some example baud rates, and the divisor to be used:

(38.4)

00 to FF

Notes:

1. The PP 0C value must be provided as hex digits only. The

decimal values (listed above in brackets) are only shown for

your convenience.

2. The ELM327 can only process continuous byte receives at

rates of about 600 kbps maximum. If you need to connect at

a higher rate, add a delay between the bytes to maintain an

average rate of 600 kbps or less.

3. A value of 00 provides a baud rate of 9600 bps.

Carriage Return Character

00 to FF

Baud Rate

(kbps)

19.2

38.4

57.6

115.2

230.4

PP 0C value

(208)

(104)

(69)

(35)

(17)

500

(8)

hex

(dec)

71 of 94

Description

Values

Default

Type

(10011010)

00 to FF

Power Control options

Each bit controls an option, as follows:

b7: Master enable

0: off

1: on

if 0, pins 15 and 16 perform as described for v1.0 to v1.3a

(must be 1 to allow any Low Power functions)

b6: Pin 16 full power level

0: low

1: high

normal output level, is inverted when in low power mode

b5: Auto LP control

0: disabled

1: enabled

allows low power mode if the RS232 activity stops

b4: Auto LP timeout

0: 5 mins

1: 20 mins

no RS232 activity timeout setting

b3: Auto LP warning

0: disabled

1: enabled

if enabled, says ‘ACT ALERT’ 1 minute before RS232 timeout

b2: Ignition control

0: disabled

1: enabled

allows low power mode if the IgnMon input goes low

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