67 of 83ELM329DSC Elm Electronics – Circuits for the Hobbyist
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Programmable Parameter Summary (continued)
PP Description Values Default Type
24 CAN auto formatting (AT CAF default setting) D
25 D
CAN filler byte (used to pad out messages) 00
CAN auto flow control (AT CFC default setting)
00
(ON)
00
(ON)
00 to FF
00 = ON
FF = OFF
00 = ON
FF = OFF
26 D
20 Default (Single Wire) Transceiver Mode
M0 - M1 pin setting during normal CAN operation (see page 24)
03
(normal)
00 to 03 D
21 Default CAN Silent Monitoring setting (for AT CSM) RFF
(ON)
FF = ON
00 = OFF
22 CAN wakeup message rate (AT SW default setting)
setting = value x 20.48 msec
00 to FF 62
(2.0 sec)
D
00 to 02 D23 Default Wakeup Mode (AT WM setting) 00
(OFF)
0F F8
(11111000)
00 to FFMore Power Control options
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
no CAN activity timeout setting
b5: Auto LP (CAN) warning 0: disabled 1: enabled
if enabled, says ‘ACT ALERT’ 1 minute before timeout
b4: Active LED 0: off 1: flashes
setting during low power, if there was CAN activity 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)
R
28 FF
(11111111)
00 to FF DCAN Filter outputs (controls CAN sends while searching)
The bits of this byte control options, as follows:
b7: 500 kbps match 0: ignored 1: required
b6: 250 kbps match 0: ignored 1: required
b5 to b1: reserved for future - leave set to 1
b0: send if bus is quiet 0: not allowed 1: allowed
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