Reading The Registers; Id And Device Type Registers; Status/Control Register - HP E1472A User Manual

1
Reading the
Registers
ID and Device Type
Registers
Status/Control
Register
56 RF Multiplexer Registers
You can read the following RF Multiplexer registers:
• Manufacturer ID Register (base +00
• Device Type Register (base +02
• Status/Control Register (base +04
• Remote Module Register (base +06
• Remote Module Register (base +08
• Remote Module Register (base +0A
• Module 00 Bank 00-02 Channel Enable Register (base +10
• Module 00 Bank 03-05 Channel Enable Register (base +12
• Module 01 Bank 00-02 Channel Enable Register (base +14
• Module 01 Bank 03-05 Channel Enable Register (base +16
• Module 02 Bank 00-02 Channel Enable Register (base +18
• Module 02 Bank 03-05 Channel Enable Register (base +1A
ID Register: Reading this register returns FFFF
the manufacturer and that the module is an A16 register based device.
Device Type Register: Reading this register returns 0180
E1474A RF Multiplexer module, with or without Expander module(s) connected.
The HP E1474A/E1475A use the same Device ID as the HP E1472A/E1473A.
However, the relay module will generate a different remote module code to
distinguish between the modules (see Remote Module ID Registers in this
appendix).
The Status/Control Register informs the user about the modules status. Each relay
requires about 15 msec execution time during which time the RF multiplexers are
" busy" . Bit 7 of this register is used to inform the user of a " busy" condition.
In addition, the interrupt generated after a channel has been closed can be disabled.
Bit 6 of this register is used to inform the user of the interrupt status.
A read of the Status/Control register (base +04
• FFBF
when the module is not busy and interrupt is enabled.
h
• FF3F
when the module is busy and interrupt is enabled.
h
• FFFF
when the module is not busy and interrupt is disabled.
h
• FF7F
when the module is busy and interrupt is disabled.
h
)
h
)
h
)
h
)
h
)
h
)
h
h
h
h
h
h
h
. This shows Hewlett-Packard as
h
if the device is either the
h
) returns:
h
)
)
)
)
)
)
Appendix B