ELM327P datasheet(56/76 Pages) ELM

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Programmable Parameter Summary (continued)

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ELM327DSH

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ELM327

RS232 baud rate divisor when pin 6 is high (logic 1)

The baud rate (in kbps) is given by 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)

08 to FF

Note that the PP 0C value must be provided as hex digits only. The

decimal values (in brackets) are only shown for your convenience.

Description

Values

Default

Type

Carriage Return Character

used to detect and send line ends

J1850 voltage settling time

setting = value x 4.096 msec

(53 msec)

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)

(10011010)

00 to FF

Power Control options

Each bit of this byte 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

b1: Ignition delay

0: 1 sec

1: 5 sec

delay after IgnMon (pin 15) returns to a high level, before

normal operation resumes

b0: reserved for future - leave set at 0

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