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0E Power Control options (continued)
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
Programmable Parameter Summary (continued)
10 J1850 voltage settling time
setting (in msec) = (PP 10 value) x 4.096
0D
(53 msec)
00 to FF
0F D5
(11010101)
00 to FFActivity Monitor options
Each bit controls an option, as follows:
b7: monitor master control 0: disabled 1: enabled
must be 1 to allow b3 to b6
b6: allow wake from Low Power 0: no 1: yes
wakes on shift from no activity to activity
b5: Auto LP control 0: disabled 1: enabled
allows low power mode if the OBD activity stops
b4: Auto LP timeout 0: 30 secs 1: 150 secs
no OBD activity timeout setting
b3: Auto LP warning 0: disabled 1: enabled
if enabled, says ‘ACT ALERT’ on timeout
b2: reserved for future - leave set at 1
b1: add exclamation mark 0: no 1: yes
if 1, sends ‘!’ before ACT ALERT and LP ALERT
b0: LP LED 0: disabled 1: enabled
if 1, the OBD Tx LED flashes when in Low Power mode
(one 16 msec flash repeated every 4 seconds)
D
R
ELM327
ELM327DSJ Elm Electronics – Circuits for the Hobbyist
www.elmelectronics.com
71 of 94
PP Description Values Default Type
11 J1850 Break Signal monitor enable
(reports BUS ERROR if break signal duration limits are exceeded)
D00
(ON)
00 = ON
FF = OFF
12 J1850 Volts (pin 3) output polarity
normal = Low output for 5V, High output for 8V
invert = High output for 5V, Low output for 8V
R00 = invert
FF = normal
FF
(normal)
13 Time delay added between protocols 1 & 2 during a search
setting (in msec) = 150 + (PP 13 value) x 4.096
I55
(498 msec)
00 to FF
ISO/KWP final stop bit width (provides P4 interbyte time)
setting (in µsec) = 98 + (PP 14 value) x 64
D14 50
(5.2 msec)
00 to FF
15 ISO/KWP maximum inter-byte time (P1), and also used for
the minimum inter-message time (P2).
setting (in msec) = (PP 15 value) x 2.112
D0A
(21 msec)
00 to FF
71


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