User`s guide

DOS Device Options
/Pn
Sets the serial port to <n> where <n> is l-4 for COMl - COM4. The
default is COMl.
/Dn
Defines the device unit number as a>, where a> is between 1 and
9, so that the DOS device name is “LONl” through “LON9”. The
default is 1 for “LONl”. This option can be used to support multiple
network interfaces on a single PC. For example, this device name is
passed as a parameter to Ixt-open ( ) when using the LonManager
API. When invoking the sample host application HA, the device may
be specified with the -D option, for example:
HA -DLON2
/Un
Sets the serial port interrupt request number (IRQ) to a non-standard
value cn>, where a> is between 1 and 7. If the serial port in use is
COM3 or COM4, you may want to use a unique, unused IRQ for that
port. Many serial ports and internal modems allow the selection of a
non-standard IRQ such as IRQ2 or IRQ5.
/C
Enables communications interrupt chaining. Some PCs may
incorporate up to four serial ports. If supported by the serial
hardware, COMl and COM3 may share the same interrupt (as do
COM2 and COM4). This option may enable the driver to support the
shared interrupt by “chaining” to the interrupt vector that was in
place when the driver was loaded.
This option is not necessary if your
system does not use COM3 or COM4, or if COM3 or COM4 use a
different interrupt request number. When installing two SLTA-10
Adapter network drivers on a system on COMl and COM3 (or COM2
and COM4 with the same interrupt request number), the last
installation of the driver should use this option. Here is an example
of a CONFIG. SYS file entry for such a system.
DEVICE=C:\LONWORKS\BIN\LDVSLTA.SYS /B38400 /A /PI
DEVICE=C:\LONWORKS\BIN\LDVSLTA.SYS /B38400 /A /P3 /C
Table 8.1 Hardware Configurations COM Ports
Device
I/O Address Interrupt (*)
COMl
Ox3F8
4
COM2
Ox2F8 3
COM3 Ox3E8 4
COM4 Ox2E8 3
(*> May be changed with the
/u option
Using the DOS Driver with SLTA-10 MIP Mode