Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 213)

10B. Installation & Configuration II. SOFTWARE GUIDES - 10. Driver488/W31
II-198 Personal488 User’s Manual, Rev. 3.0
the IEEE 488 bus if the Active Controller passes control to the board. The board may then control
the bus and, when it is done, pass control back to the System Controller or another computer,
which then becomes the Active Controller. If the board will be operating in Peripheral mode (not
System Controller), select NO in this field.
•
Timeout (ms): The time out period is the amount of time that data transfers wait before assuming
that the device does not transfer data. If the time out period elapses while waiting to transfer data,
an error signal occurs. This field is the default timeout for any bus request or action, measured in
milliseconds. If no timeout is desired, the value may be set to zero.
•
Device Type: This field specifies the type of device represented by the IEEE device name
selected.
I/O Address
•
IEEE 488: This field is the I/O base address which sets the addresses used by the computer to
communicate with the IEEE interface hardware on the board. The address is specified in
hexadecimal and can be
02E1 , 22E1 , 42E1 or 62E1 .
Note: This field does not apply to the NB488. Instead, the NB488 uses the I/O address of the
data register (the first register) of the LPT port interface, typically
0x0378 .
•
Bus Terminators: The IEEE 488 bus terminators specify the characters and/or end-or-identify
(
EOI ) signal that is to be appended to data that is sent to the external device, or mark the end of
data that is received from the external device.
This second Driver488/W31
example displays the configuration
of an NB488 IEEE interface
module, specified in the upper
screen section. This screen
resembles the previous IEEE
interface example with the
exception of 3 different
configuration parameters which
are described below.
Configuration Parameters
•
LPT Port: The LPT port is
the external parallel port to be
connected to the NB488.
Valid selections are:
LPT1 ,
LPT2 , or LPT3 . This field
takes the place of the I/O
Address field.
•
Enable Printer Port:
Because most laptop and
notebook PCs provide only
one LPT port, the NB488 offers LPT pass-through for simultaneous IEEE 488 instrument control
and printer operation. If this option is selected, a printer connected to the NB488 will operate as if
it were connected directly to the LPT port. If not enabled, then the printer will not operate when
the NB488 is active. The disadvantage of pass-through printer support is that it makes
communications with the NB488 about 20% slower.
Note: If this option is in use, it is important to note that printing will not occur while any IEEE
devices are open. If you attempt to print while IEEE 488 devices are open, the program responds
as if printing were accomplished. However, Windows actually spools the printer output but then
waits until all IEEE 488 devices are closed before printing.
Configuration Utility Screen for NB488