ELM329DSC Elm Electronics – Circuits for the Hobbyist
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Programmable Parameter Summary (continued)
PP Description Values Default Type
2B 02
(250 Kbps)
01 to 40Protocol A (SAE J1939) CAN baud rate divisor.
The baud rate is determined by the formula:
rate (in kbps) = 500 ÷ value
For example, setting this PP to 19 (ie. decimal 25) provides
a baud rate of 500/25 = 20 kbps.
R
2A 08
(00001000)
00 to FF DCAN Error Checking (controls testing)
Each bit of this byte controls an option, as follows:
b7: ISO 15765 Data Length 0: accept any 1: must be 8 bytes
Allows acceptance of non-standard data without errors.
b6: ISO 15765 PCI=00 0: allowed 1: not allowed
Some vehicles send 00’s, which can be confusing.
b5: reserved for future - leave set to 0
b4: reserved for future - leave set to 0
b3: Wiring Test 0: bypass 1: perform
Certain wiring conditions may cause problems. This allows
a quick test, which weeds out some problems.
b2: reserved for future - leave set to 0
b1: reserved for future - leave set to 0
b0: reserved for future - leave set to 0
29 Printing of the CAN data length (DLC digit) when printing header
bytes (AT D0/D1 default setting)
DFF
(OFF)
00 = ON
FF = OFF
2C E0
(11100000)
00 to FF
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 2)
b3: reserved for future - leave set at 0.
b2, b1, and b0 determine the data formatting options:
b2 b1 b0 Data Format
0 0 0 none
0 0 1 ISO 15765-4
0 1 0 SAE J1939
Other combinations are reserved for future updates – results will
be unpredictable if you should select one of them.
R
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