Giga-tronics 8003, Руководство по эксплуатации

Страница: 214 / 258

8003 Precision Scalar Analyzer
3-72 Manual 20791, Rev. C, June 2001
3.3.34 Pass Through Feature
The GPIB/PRIVATE rear panel connector is physically similar to the GPIB/SYSTEM interface port,
but it is used specifically to control all compatible sources, plotters, and printers that are being used in
the setup.
The transfer of commands and data is performed by first sending a Pass Through command PT d to the
8003, where d is the decimal address of the desired device. Subsequent addressing of the GPIB/
PRIVATE interface will pass through commands to the selected instrument.
The address of the GPIB/PRIVATE interface is determined by complementing the least significant bit
of the current 8003 address. For example, since the 8003 default address is 4 decimal = 0100 binary, the
default GPIB/PRIVATE address is 5 decimal = 0101 binary. As another example, if the 8003 address
were set to 7 decimal = 111 binary, the GPIB/PRIVATE address would become 6 decimal = 110 binary.
An example of how to pass through commands to the source with address 20 using the 8003 default
address (4 decimal) is:
1. Address device 4 (the GPIB/SYSTEM interface on the 8003) and send the command PT 20 .
2. Address device 5 (the GPIB/PRIVATE interface) and send commands to the source.
3. Address device 4. This returns the 8003 to its normal GPIB/SYSTEM operation.
An example of how to pass through commands to the plotter with address 05 decimal using the 8003
default address (4 decimal) is:
1. Address device 4 (the GPIB/SYSTEM interface) and send the command PT 05 .
2. Address device 5 (the GPIB/PRIVATE interface) and send commands to the plotter.
3. Address device 4. This returns the 8003 to its normal GPIB/SYSTEM operation.