Searching for ISO9141 protocol information

[avos at cochlear.com.au]

     Hi,
     
     I am searching for information on the ISO9141 protocol. If I could get 
     a copy of the specification that would be great, but if anyone knows 
     information and is willing to email me, that would also be good.
     
     I have noticed that a dianostic software package that complies to 
     ISO9141 uses an RS-232 port to connect to the OBD connector. From this 
     I assume that it is some sort of serial protocol, and at a guess, I 
     would say that it is similar to ALDL (but I am unsure whether it is 
     single or double wire: full-duplex or half-duplex). I would like to 
     know the baud rate and data format is, and get any information on the 
     actual protocol data messages used. 
     
     I think I have read the protocol is available to the public, but I 
     havn't seen it yet, and therefore you probably have to pay for it 
     which I would rather not do. If anyone has a copy of the protocol, or 
     has information on the protocol, and they are willing to give me some 
     information, it would be appreciated.
     
     Thanks in advance,
     
     Adrian