HP E1368A manual Writing to the Registers, Status/Control Register Channel Enable Register

Status/Control Register

Channel Enable 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 + 0416) returns FFFF16 when the module is not busy or returns FF7F16 (bit 7 is low-true) when the module is busy.

A read of the Channel Register (base + 0816) always returns FFFF16, regardless of the channel states.

Writing to the Registers

Channel Enable Register

Note

You can write the following Microwave Switch registers:

Channel Enable Register (base + 0816)

Writes to the Channel Enable Register (base + 0816) 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.

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