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Channel Enable
Register
A read of the Channel Enable register (base + 08
16
) always returns FFFF
16
,
regardless of the channel states.
Writing to the Registers
You can write to the following Form C Switch registers:
• Status/Control register (base + 04
16
)
• Channel Enable register (base + 08
16
)
The only write allowed to the Status/Control register (base + 04
16
) is to bit
0. Writing a "1" to bit 0 resets the switch (all channels open) You must then
write a "0" to bit 0 to complete the reset.
Note All relays are latching and will remain in the last state during power-down
and power-up unless a reset occurs. A reset connects all channel common
(C) terminals to the corresponding normally closed (NC) terminals. Any
combination of channel open or closed states is allowed.
Channel Enable
Register
Writes to the Channel Enable register (base + 08
16
) enable you to open or
close the desired channel (see Figure B-1). For example, write a "1" to bit 2
of the Channel Enable register to close channel 02. Or, write a "0" to bit 14
of the register to open channel 14.
Appendix B Agilent E1364A Form C Switch Registers 67