Rockwell Automation 57C445 AutoMax PC Link Interface Module - Manual (Page 17)

3Ć5
3.1.4 Configuring the Base Memory Address
The PC Link Interface module occupies 16K of host memory space.
The base address is userĆselectable by writing to a port register
which will normally be set automatically by the installation program.
The default location is 0xD000. Unless there is a known conflict with
other hardware in the host system, the default memory address
should be used. Note that if your personal computer is equipped with
ShadowRAM," all ShadowRAM features must be disabled before the
PC Link module will function properly. If multiple modules are
installed in the same personal computer, each must be assigned a
separate memory address. If you are using the PC Link module with
the AutoMax Programming Executive software, you must use one of
the following base memory addresses: 0xD000, 0xD400, 0xD800,
0xDC00. The memory address is not set by switches or jumpers. It is
set when you run the software installation procedure (INSTALL).
When you run INSTALL, the memory address is passed into the
loader routine which enables the module at a particular memory
address. Since the module memory is not enabled until the loader
routine installs the software (RENET or RERIO) on it, memory
management packages may try to use the intended module address
for switching in expanded memory. This must be prevented since it
would block any access to the module's physical address and render
the module inoperative. Refer to the documentation for your memory
management package to determine how to exclude the area of
memory where the PC Link module is to reside. Table 3.2 lists the
possible locations and describes other hardware that might be using
the space.