ELM329
Programmable Parameter Summary (continued)
PP
Description
Values
Default
Type
0F
More Power Control options
00 to FF
F8
R
(11111000)
Each bit of this byte controls an option, as follows:
b7: Auto LP (CAN) control
0: disabled
1: enabled
allows low power mode if the CAN activity stops
b6: Auto LP (CAN) timeout
0: 2 mins
1: 10 mins
1: enabled
no CAN activity timeout setting
b5: Auto LP (CAN) warning 0: disabled
if enabled, says ‘ACT ALERT’ 1 minute before timeout
b4: Active LED 0: off 1: flashes
setting during low power, if there is a CAN input on pin 11
b3: Previous CAN 0: required 1: ignored
wakeup on CAN activity may be set to require that there was
CAN activity prior to going to low power mode
b2: reserved for future - leave set at 0
b1: reserved for future - leave set at 0
b0: Control output
0:normal
1:CAN Monitor
if set to 1, the Control (pin 4) output follows CAN activity
(Control is a high level when there is CAN activity detected)
20
21
22
Default (Single Wire) Transceiver Mode
M0 - M1 pin setting during normal CAN operation (see page 23)
00 to 03
03
D
R
D
(normal)
Default CAN Silent Monitoring setting (for AT CSM)
FF = ON
00 = OFF
FF
(ON)
CAN wakeup message rate (AT SW default setting)
setting = value x 20.48 msec
00 to FF
00 to 02
62
(2.0 sec)
23
24
25
Default Wakeup Mode (AT WM setting)
00
D
D
D
(OFF)
CAN auto formatting (AT CAF default setting)
CAN auto flow control (AT CFC default setting)
00 = ON
FF = OFF
00
(ON)
00 = ON
FF = OFF
00
(ON)
CAN filler byte (used to pad out messages)
00
26
29
00 to FF
D
D
Printing of the CAN data length (DLC digit) when printing header
bytes (AT D0/D1 default setting)
00 = ON
FF = OFF
FF
(OFF)
ELM329DSB
Elm Electronics – Circuits for the Hobbyist
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