User`s guide

SLTA-10 Adapter. This feature has been added to the DOS driver for the
SLTA-10 Adapter.
Presentation Layer Protocol
The network driver exchanges LonTalk packets with the host application at
the presentation layer. The LonTalk packet enclosed in a command of type
niCOMM or niNETMGMT is described in detail in the Host Application
Programmer’s Guide. It is summarized here for convenience.
ExpMsgHdr
or
NetVarHdr
SendAddrDtl
RcvAOdbrDtl
Resp&drDtl
UnprocessedNV
or
ExplicitMsg
Message
Header
size = 3
Network
Address
size = 11
Data
size
varies
Figure 9.7 Application Buffer Format
The SLTA-10 firmware is configured with explicit addressing enabled, and
therefore the ll-byte network address field is always present in an uplink
or downlink buffer. The firmware is also configured with host selection
enabled, so the data field of the buffer is either an unprocessed network
variable or an explicit message.
9-14 Creating an SLTA-10 MIP Mode Driver