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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  
Error Messages and Alerts  
The following shows what the ELM329 will send to  
warn you of a condition or a problem. Some of these  
messages do not appear if using the automatic search  
for a protocol, or if the Programmable Parameter bits  
disable them.  
ACT ALERT  
DATA ERROR  
This message occurs as a warning that there has  
been no CAN or RS232 activity (ie commands or  
messages received) for some time, and the IC is about  
to go to the low power mode in one minute. If an input  
signal is found during that minute, the switch to low  
power will be cancelled.  
There was a response from the vehicle, but the  
information was incorrect or could not be recovered.  
<DATA ERROR  
There was an error in the line that this points to,  
either from an incorrect checksum, or a problem with  
the format of the message (the ELM329 still shows you  
what it received). There could have been a noise burst  
which interfered, possibly a circuit problem, or perhaps  
you have the CAN Auto Formatting (CAF) on and you  
are looking at a system that is not of the ISO 15765-4  
format. Try resending the command again – if it was a  
noise burst, it may be received correctly the second  
time.  
This message may be disabled by setting PP 0E  
bit 3 (RS232) or PP 0F bit 5 (CAN) to ‘0’.  
BUFFER FULL  
The ELM329 provides a 512 byte internal RS232  
transmit buffer so that OBD messages can be received  
quickly, stored, and sent to the computer at a more  
constant rate. Occasionally (particularly with some  
CAN systems) the buffer will fill at a faster rate than it  
is being emptied by the PC. Eventually it may become  
full, and no more data can be stored (it is lost).  
If you are receiving BUFFER FULL messages,  
and you are using a lower baud data rate, give serious  
consideration to changing your data rate to something  
higher. If you still receive BUFFER FULL messages  
after that, you might consider turning the headers and  
maybe the spaces off (with AT H0, and AT S0), or  
using the CAN filtering commands (AT CRA, CM and  
CF) to reduce the amount of data being sent.  
ERRxx  
There are a number of internal errors that might be  
reported as ERR with a two digit code following. These  
occur if an internally monitored parameter is found to  
be out of limits, or if a module is not responding  
correctly. If you witness one of these, contact Elm  
Electronics for advice.  
One error that is not necessarily a result of an  
internal problem is ERR94. This code represents a  
‘fatal CAN error’, and may be seen if there are CAN  
network issues (some non-CAN vehicles may use pins  
6 and 14 of the connector for other functions, and this  
may cause problems). If you see an ERR94, it means  
that the CAN module was not able to reset itself, and  
needed a complete IC reset to do so. You will need to  
restore any settings that you had previously made, as  
they will have returned to their default values.  
CAN ERROR  
The CAN system had difficulty initializing, sending,  
or receiving. Often this is simply from not being  
connected to a CAN system when you attempt to send  
a message, but it may be because you have set the  
system to an incorrect protocol, or to a baud rate that  
does not match the actual data rate. It is possible that  
a CAN ERROR might also be the result of a wiring  
problem, so if this is the first time using your ELM329  
circuit, review all of your CAN interface circuitry before  
proceeding.  
LP ALERT  
This appears as a warning that the ELM329 is  
about to switch to the low power (standby) mode of  
operation in 2 seconds time. This delay is provided to  
allow an external controller enough time to prepare for  
the change in state. No inputs or voltages on pins can  
stop this action once initiated.  
If you are seeing these messages while working  
with the CAN silent mode off, then return to CAN silent  
mode (AT CSM1). There is likely a problem with your  
baud rate.  
ELM329DSB  
Elm Electronics – Circuits for the Hobbyist  
www.elmelectronics.com  
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