Lpc2000

I do not know where to purchase the SAE's J1939 Spec from, but in that 
spec it probably tells you how to send a Long-Message-Start (to 
initialize the long message), which is where you define the total 
number of bytes.  Then you would send 4 more (Long-Message-Data) 
packets.

I use a sub-set of J1939 in my system, so I think you would send long 
messages the same way I do....

I use PGN 0x0ECFF (Long-Msg-Start) to define the long message.
The 8 byte of data would be:
 Always_32 ( 0x20 )
 number_of_bytes_in_msg_LSB ( 28 for you)
 number_of_bytes_in_msg_MSB ( 0 )
 #of_packets ( 4 )
 always_255 ( 0xFF )
 PGN_of_data_to_follow_LSB ( 0xE3 )
 PGN_of_data_to_follow_MID ( 0xFE )
 PGN_of_data_to_follow_MSB ( 0x00 )

Then PGN 0x0EBFF (Long-Msg-Data)
The 8 bytes of data would be:
 packet#
 data_byte_of_long_msg
 data_byte_of_long_msg
 data_byte_of_long_msg
 data_byte_of_long_msg
 data_byte_of_long_msg
 data_byte_of_long_msg
 data_byte_of_long_msg

Hope that helps,
 - Mike


--- In lpc2000@yahoogroups.com, "gregdeuerling" <egads@f...> wrote:
> 
> I'm using a LPC2194 and I need to send a J1939 message that has more 
> than 8 bytes.  I know I'm supposed to use a PDU2 type "broadcast 
> announce message", or BAM.
> 
> In short I need to send a message with 28 bytes to PGN 0xFEE3.
> I know how to send a normal J1939 message, how do I set up the 
> LPC2194's CAN registers to send a BAM message?
> 
> I've Googled all over and can't seem to find the info.  I also looked 
> at the SAE site and I can't even figure out which document to 
purchase 
> that has this info.
> 
> Can any give me some tips of point me to the SAE J1939 document to 
> purchase?
> 
> Thanks!!!