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ELM329P 参数 Datasheet PDF下载

ELM329P图片预览
型号: ELM329P
PDF下载: 下载PDF文件 查看货源
内容描述: CAN解释 [CAN Interpreter]
分类和应用:
文件页数/大小: 76 页 / 353 K
品牌: ELM [ ELM ELECTRONICS ]
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ELM329  
Programmable Parameters (continued)  
command, so if you change its value, you may not be  
able to undo your change. In this case, your only  
recourse may be to force all of the PPs off with a  
hardware trick.  
When the ELM329 first powers up, it looks for a  
jumper between pin 28 (the OBD Tx LED output) and  
circuit common (VSS). If a jumper is in place, it will turn  
off all of the PPs for you, restoring the IC to the factory  
defaults. To use this feature, simply connect a jumper  
to circuit common (which appears in numerous places  
- pins 8 or 19 of the ELM329, pin 5 of the RS232  
connector, one end of most capacitors, or at the OBD  
connector), then hold the other end of the jumper to  
pin 28 while turning the power on. When you see the  
RS232 Rx LED begin to flash quickly, remove the  
jumper – the PPs are off.  
This feature should only be used when you get  
into trouble too deeply, and it’s your only choice (since  
putting a jumper into a live circuit might cause damage  
if you put it in the wrong place).  
Programmable Parameter Summary  
The following pages provide a list of the currently  
available Programmable Parameters (the currently  
unimplemented ones are not shown here). All values  
are in hexadecimal - the ELM329 does not accept  
decimal numbers.  
I - the effect is Immediate,  
D - takes effect after Defaults are restored  
(AT D, AT Z, AT WS, MCLR or power off/on)  
R - takes effect after a Reset  
Note that the ‘Type’ column indicates when any  
changes will take effect. The four possible values are  
as shown to the right:  
(AT Z, AT WS, MCLR or power off/on)  
P - needs a Power off/on type reset  
(AT Z, MCLR, or power off/on)  
PP  
Description  
Values  
Default  
Type  
00  
Perform AT MA immediately after powerup or reset  
00 = ON  
FF = OFF  
FF  
R
(OFF)  
01  
03  
04  
06  
07  
09  
0A  
Printing of header bytes (AT H default setting)  
00 = ON  
FF = OFF  
FF  
D
D
D
R
I
(OFF)  
NO DATA timeout time (AT ST default setting)  
setting = value x 4.096 msec  
00 to FF  
00 to 02  
00 to FF  
01 to 0F  
19  
(102 msec)  
Default Adaptive Timing mode (AT AT setting)  
OBD Source (Tester) Address. Not used for J1939 protocols.  
Last Protocol to try during automatic searches  
Character echo (AT E default setting)  
01  
F1  
0F  
00 = ON  
FF = OFF  
00  
R
R
(ON)  
Linefeed Character  
00 to FF  
0A  
ELM329DSB  
Elm Electronics – Circuits for the Hobbyist  
61 of 76  
www.elmelectronics.com