HP E1368A - Manual (Page 78)

Status/Control
Register
Each coaxial switch requires about 30 msec execution time (close to open or
open to close) during which time the switch is "busy". A read of the
Status/Control Register (base + 04
16 ) returns FFFF 16 when the module is
not busy or returns FF7F
16
(bit 7 is low-true) when the module is busy.
Channel Enable
Register
A read of the Channel Register (base + 08
16
) always returns FFFF
16
,
regardless of the channel states.
Writing to the Registers
You can write the following Microwave Switch registers:
Channel Enable Register (base + 08 16 )
Channel Enable
Register
Writes to the Channel Enable Register (base + 08
16
) enable you to open or
close the desired channel. For example, write a "1" to bit 2 of the Channel
Enable Register to close channel 02. Or, write a "0" to bit of the register to
open channel 00.
Note All HP 3331X and HP 876X Microwave Switches are latching and will
remain in the last state during power down. Performing a reset (or at
power-up) opens all channels (refer to Figure 2-6). Any combination of
channel open or closed states is allowed.
Appendix B HP E1368A/69A/70A Registers 77
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