dale@lamont.ldgo.columbia.edu (dale chayes) (11/13/90)
Can anyone point me to the specifications for the MIL-STD-1553 interface? I've run across references to it in the data sheets for the Harris Manchester encoder/decoder data sheets (Harris 1989 Digital Product Databook (Military.)) Specifically, I'm looking at the HD-6409 and the HD-15530/31 parts but not for a military application. They were suggested to me for use in the data link for a bore hole geophysical logging tool. I'd also be interested in design/application experience with Manchester encoded data links/telemetery systems. Also pointers to other manufacturers Manchester encoders would be appreciated. Thanks in advance, Dale -- Dale Chayes Lamont-Doherty Geological Observatory of Columbia University Route 9W, Palisades, N.Y. 10964 dale@lamont.ldgo.columbia.edu voice: (914) 359-2900 extension 434 fax: (914) 359-6817
jws@thumper.mlb.semi.harris.com (James W. Swonger) (11/13/90)
MIL-STD-1553 is a government (military) document specifying in EXTREME detail the characteristics of the data communications standard - pysical, electrical, protocols, all that wonderful stuff. If you are just putting a data source down the hole, I think that the 1553 standard is massive overkill. A full 1553 implementation requires intelligence of some sort at both ends. A lot of handshaking and message passing goes on even to send one data word; like - I'm sending data, OK, send data, here comes the data, <data>, did you get the data, yeah I got the data... If the data flow is one-way then a true 1553 controller will probably be disturbed by the lack of handshaking. There are also a number of bus activity protocols to be adhered to like time between messages, number of data words in a row, etc. If you're after just the encoding (I assume for error rejection mostly) then brewing up a link might not be so bad - but you can probably do as well with a simpler system unless you expect extreme noise.