Programmable Parameter Summary (continued)
56 of 76ELM327DSH Elm Electronics – Circuits for the Hobbyist
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PRS232 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:
68
(38.4)
08 to FF
0C
Note that the PP 0C value must be provided as hex digits only. The
decimal values (in brackets) are only shown for your convenience.
PP Description Values Default Type
0D Carriage Return Character
used to detect and send line ends
10 J1850 voltage settling time
setting = value x 4.096 msec
R0D
0D
(53 msec)
00 to FF
00 to FF
Baud Rate
(kbps)
19.2
38.4
57.6
115.2
230.4
PP 0C value
D0 (208)
68 (104)
45 (69)
23 (35)
11 (17)
500
08 (8)
hex (dec)
0E 9A
(10011010)
00 to FFPower 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
R
R
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