ADR is the GPIB address of the device,
MEM the memory segment,
NP the number of pixels to be read and
NAME the name of the SCAN.
Note: when the device is accessed for the first time,
an error message is generated which tells the user
that the device does not respond with a poll byte.
The user has to ignore this error.
e.g.:
* = oma_1460( 2, 1, 1024, t1)