Bedienungsanleitung Elm 327 (Seite 16 von 94) (Englisch)

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ELM327

ELM327DSJ Elm Electronics – Circuits for the Hobbyist

www.elmelectronics.com

detected. If there should be a significant number of

errors (due to a hardware or software problem), the

device will go off-line in order to not affect other data

on the bus. The AT CS command lets you see both

the transmitter (Tx) and the receiver (Rx) error counts,

in hexadecimal. If the transmitter should be off (count

>FF), you will see ‘OFF’ rather than a specific count.

CSM0 and CSM1 [ CAN Silent Monitoring off or on ]

The ELM327 was designed to be completely silent

while monitoring a CAN bus. Because of this, it is able

to report exactly what it sees, without colouring the

information in any way. Occasionally (when bench

testing, or when connecting to a dedicated CAN port),

it may be preferred that the ELM327 does not operate

silently (ie generates ACK bits, etc.), and this is what

the CSM command is for. CSM1 turns it on, CSM0

turns it off, and the default value is determined by

PP 21. Be careful when experimenting with this. If you

should choose the wrong baud rate then monitor the

CAN bus with the silent monitoring off, you will disturb

the flow of data. Always keep the silent monitoring on

until you are certain that you have chosen the correct

baud rate.

CTM1 [ set the Timer Multiplier to 1 ]

This command causes all timeouts set by AT ST

to be multiplied by a factor of 1. Note that this currently

only affects the CAN protocols (6 to C). CTM1 is the

default setting.

CTM5 [ set the Timer Multiplier to 5 ]

This command causes all timeouts set by AT ST

to be multiplied by a factor of 5. Note that this currently

only affects the CAN protocols (6 to C).

This command was originally added (as JTM5) to

assist with the retrieving of some J1939 messages.

We have since had several requests to allow it to

affect all CAN modes, and so have modified the JTM5

code and added the new CTM1/CTM5 commands. If

using CTM5, we caution that the Adaptive Timing code

does not monitor changes in the setting, so we advise

turning it off (with AT AT0).

By default, this multiplier is off.

CV dddd [ Calibrate the Voltage to dd.dd volts ]

The voltage reading that the ELM327 shows for an

AT RV request can be calibrated with this command.

The argument (‘dddd’) must always be provided as 4

digits, with no decimal point (it assumes that the

decimal place is between the second and the third

digits).

To use this feature, simply use an accurate meter

to read the actual input voltage, then use the CV

command to change the internal calibration (scaling)

factor. For example, if the ELM327 shows the voltage

as 12.2V while you measure 11.99 volts, then send

AT CV 1199 and the ELM327 will recalibrate itself for

that voltage (it will actually read 12.0V due to digit

roundoff). See page 29 for some more information on

how to read voltages and perform the calibration.

CV 0000 [ restore the factory Calibration Value ]

If you are experimenting with the CV dddd

command but do not have an accurate voltmeter as a

reference, you may soon get into trouble. If this

happens, you can always send AT CV 0000 to restore

the ELM327 to the original calibration value.

D [ set all to Defaults ]

This command is used to set the options to their

default (or factory) settings, as when power is first

applied. The last stored protocol will be retrieved from

memory, and will become the current setting (possibly

closing other protocols that are active). Any settings

that the user had made for custom headers, filters, or

masks will be restored to their default values, and all

timer settings will also be restored to their defaults.

D0 and D1 [ display of DLC off or on ]

Standard CAN (ISO 15765-4) OBD requires that

all messages have 8 data bytes, so displaying the

number of data bytes (the DLC) is not normally very

useful. When experimenting with other protocols,

however, it may be useful to be able to see what the

data lengths are. The D0 and D1 commands control

the display of the DLC digit (the headers must also be

on in order to see this digit). When displayed, the

single DLC digit will appear between the ID (header)

bytes and the data bytes. The default setting is

determined by PP 29.

DM1 [ monitor for DM1s ]

The SAE J1939 Protocol broadcasts trouble codes

periodically, by way of Diagnostic Mode 1 (DM1)

messages. This command sets the ELM327 to

AT Command Descriptions (continued)

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