Prog_Parameters.pdf

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ELM327 Programmable Parameters
Version in which the Programmable Parameter first appeared…
version
1.0
PP
-
Description
none
1.0a
-
none
1.1
01
02
03
09
0A
0D
10
11
13
16
17
18
24
25
26
29
Printing of header bytes (AT H default setting)
Allow long messages (AT AL default setting)
NO DATA timeout time (AT ST default setting)
Character echo (AT E default setting)
Linefeed Character
Carriage Return Character
J1850 voltage settling time
J1850 Break Signal monitor enable
Auto search time delay between protocols 1 & 2
Default ISO baud rate (AT IB default setting)
ISO wakeup message rate (AT SW default setting)
Auto search time delay between protocols 4 & 5
CAN auto formatting (AT CAF default setting)
CAN auto flow control (AT CFC default setting)
CAN filler byte (used to pad out messages)
Printing of the CAN data length (DLC) default setting
1.2
00
04
06
07
0C
2B
2C
2D
2E
2F
Perform AT MA after powerup or reset
Default Adaptive Timing mode (AT AT setting)
OBD Source (Tester) Address
Last Protocol to try during automatic searches
RS232 baud rate divisor when pin 6 = 5 volts
Protocol A (SAE J1939) CAN baud rate divisor
Protocol B (USER1) CAN options
Protocol B (USER1) CAN baud rate divisor
Protocol C (USER2) CAN options
Protocol C (USER2) CAN baud rate divisor
1.2a
-
no changes
1.3
2A
CAN Error Checking
Page 1 of 2
          Elm
Electronics Inc., December 2016
ELM327 Programmable Parameters
Version in which the Programmable Parameter first appeared…
version
PP
Description
1.3a
2A
b3, b4, b5 options added
1.4
0E
12
15
19
2C
2E
Power Control Options
J1850 Volts (pin 3) output polarity
Minimum inter-message time for protocols 3 to 5
Time delay after protocol 5 when searching
b4 option added
b4 option added
1.4b
21
Default CAN Silent Monitoring Setting
2.0
0C
0F
14
15
19
1A
1B
1C
1D
modified to allow a wider range
Activity Monitor options
ISO/KWP final stop bit width (provides P4 interbyte time)
adjusted timing
changed default value
Protocol 5 fast initiation active time (TiniL)
Protocol 5 fast initiation passive time (TiniH)
ISO/KWP outputs used for initiation
ISO/KWP P3 time (delay before sending requests)
2.1
13
18
19
1E
28
2A
default value changed
default value and time multiplier change
default value changed
ISO/KWP delay before initiation starts
CAN Filter settings
b0, b1, b2 options added
2.2
19
1F
default value changed from 31 to 4F
KWP length byte to include checksum or not
          Elm
Electronics Inc., December 2016
Page 2 of 2

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