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Appendix B
HP E1368A/69A/70A Registers
Register Definitions
All three Microwave Switch modules are register-based devices. See the
tables below for register definitions.
Manufacturer ID Register
b + 00
16
1514131211109876543210
Write Undefined
Read** Manufacturer ID
*Returns FFFF
16
= Hewlett-Packard A16 only register-based.
Device Type Register
b + 02
16
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Write Undefined
Read** Manufacturer ID
Status/Control Register
b + 04
16
151413121110987 6543210
Write* Undefined
Read** Manufacturer ID B 7F
16
*R = Switch reset to power-on state (all switches open)
**R = Status “busy” is true low in bit #7 (FF7F
16
)
Channel Enable Registers
b + 08
16
1514131211109876543210
Write*
CH04 CH03 CH02 CH01 CH00
Read* Always Returns FFFF
16
Appendix B HP E1368A/69A/70A Registers 75