How To Configure WPAN Gateway to work with an E-VDT

Configuration
Protocol Setting Command
WPAN Gateway E-VDT Report Messages
Commands for E-VDT Reports
Commands for Querying E-VDT Reports Parameter Configuration
Commands to Display E-VDT Parameter Values
Command to Query Single/All E-VDT Parameter Values

Configuration

In order to successfully connect to an engine or vehicle diagnostic port, the protocol must match between the transmitter and engine/vehicle.

With the default setting, the E-VDT will search for a valid protocol and connect to it. However, this auto search feature may not work on some vehicles; in this case, the user will need to change the protocol setting of the E-VDT. Protocols 1 to 9 are for OBDII compliant vehicles.

0 – Automatic
1 – SAE J1850 PWM
2 – SAE J1850 VPW
3 – ISO 9141-2
4 – ISO 14230-4 KWP (slow)
5 – ISO 14230-4 KWP (fast)
6 – ISO 15765-4 CAN (11-bit ID, 500k baud)
7 – ISO 15765-4 CAN (29-bit ID, 500k baud)
8 – ISO 15765-4 CAN (11-bit ID, 250k baud)
9 – ISO 15765-4 CAN (29-bit ID, 250k baud)
10 – SAE J1939 CAN (29-bit ID, 250k baud)
11 – USER1 CAN (11-bit ID, 125k baud)
12 – USER2 CAN (11-bit ID, 50k baud)

Protocol Setting Command

AT^OBDSP=n	configure protocol setting n=0 – 12
AT^OBDSP?	show protocol setting

Examples:
To change the protocol setting, for example, you want to change to ISO 9141-2:

at^obdsp=3	set protocol to ISO 9141-2
at^&w	save changes

To show the protocol setting, type in the following:

at^obdsp?	display protocol setting
Returned string:	3

WPAN Gateway E-VDT Report Messages

The WPAN Gateway receives data from the E-VDT on a continual basis; the WPAN Gateway can be configured to format engine/vehicle parameters into messages available for the DCE device.

A message can hold up to 4 parameters. Users can define up to 4 messages named POBDA to POBDD.

Commands for E-VDT Reports

AT^POBDA=n1[,n2][,n3][,n4]	configures report A
AT^POBDB=n1[,n2][,n3][,n4]	configures report B
AT^POBDC=n1[,n2][,n3][,n4]	configures report C
AT^POBDD=n1[,n2][,n3][,n4]	configures report D

Where:
n1..n4 are parameters to be displayed, n2..n4 are optional.
These commands and their associated parameters are not case sensitive.
The valid values for n1 – n4 are parameters from the E-VDT table.

Example:
at^pobda=p2,p8,p25 configure POBDA message to report parameters P2,P8 and P25

Commands for Querying E-VDT Reports Parameter Configuration

AT^POBDA?	view the configuration of report A
AT^POBDB?	view the configuration of report B
AT^POBDC?	view the configuration of report C
AT^POBDD?	view the configuration of report D

WPAN Gateway to DCE message:

n1[,n2][,n3][,n4] <CR><LF>

Example:

AT^POBDA =P1,P2,P3,P5

Returned String:
P1,P2,P3,P5

Commands to Display E-VDT Parameter Values

AT^SHOWPOBDA	display E-VDT report A
AT^SHOWPOBDB	display E-VDT report B
AT^SHOWPOBDC	display E-VDT report C
AT^SHOWPOBDD	display E-VDT report D

Example:

AT^POBDA=P1,P2,P3,P5

Returned String:
$POBDA,A,p1=85,p2=1544,p3=50,0*74

If a parameter is not supported by the engine or vehicle, only commas will be displayed
Available parameters are listed in the Appendix.

$POBDA,A,,,p2=1544*19

Command to Query Single/All E-VDT Parameter Values

Poll individual engine parameters from the Gateway

AT^OBDPARAM? pn
Where:
pn is the engine parameter

If the parameter is available and valid, the response should be in the following format:
pn=value

AT^OBDPARAM? ALL

Will query all available engine/vehicle parameters
If no engine diagnostic device is connected the command will return ERROR.

Example:

AT^OBDPARAM?P1

$POBDA,A,p1=125*53