Using the GPIB Command Set with the Model 2090
Model 2090 Multi-Device Controller
IEEE 488.2 standard does not allow one behavior of the
older controllers. Sending a position or limit command
would set up the controller to respond to all future reads
with that value. The IEEE 488.2 standard requires a
query/response behavior, where the returned value must be
requested first. Thus, on the model 2090, all GPIB reads
must be preceded by a write of the associated query
command to the device. Programs designed to write the
command once and read the result (usually the current
position) over and over will not work without modification.
GETTING STARTED WITH THE GPIB
The Model 2090 contains a single GPIB port which has
been configured to accept two separate addresses. Valid
addresses are in the range of 0 to 30, although 0 is typically
reserved for the controller in charge (i.e. the PC). There are
no criteria for setting the addresses, other than that they be
different from each other, but it is recommend that the
address for Device 1 be one address less than for Device 2.
The default settings are 8 and 9.
NOTE (on using the N1/N2 numeric modes): Once a mode
is selected, it is effective for both devices. N1 mode is
backward compatible for the older model ETS-Lindgren
controllers, 1050, 1060, and 1090. This mode causes the
GPIB to respond to queries with only a 3 digit value which
was the maximum resolution of the older controllers. The
N2 mode allows one to access the higher degree of display
resolution available with the Model 2090 controller. This
will give a floating-point response, XXX.X. Note that N1 is
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© ETS-Lindgren– April, 2006
Revision G– P# 399199
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