Specifications

The WRITE
Registers
The following WRITE registers are located on the relay strain gage
multiplexers:
• Control Register (base + 04
16
)
• Tree Switch Register (base + 06
16
)
• Channel Register (base + 08
16
)
Control Register The Control Register on the relay strain gage multiplexer is used to reset the
multiplexer to its power-on state (all channels open).
base + 04
16
1514131211109876543210
Write Undefined CRD
RST
CRD RST Card Reset. Writing a one (1) to bit 0 resets the multiplexer to its
power-on state. While bit 0 is 1, the multiplexer continually resets.
Tree Switch
Register
The relay multiplexer’s Tree Switch Register controls tree relays 93, 92, 91,
and 90.
base + 06
16
1514131211109876543210
Write Undefined 93 92 91 90
Closing Tree Relay Closing a Tree Relay. Writing a one (1) to bit 3, 2, 1, or 0 closes tree relay
93, 92, 91, or 90 respectively. When making strain measurements using a
switchbox, tree relay 90 must be closed (DC voltage measurement).
Channel Register The Channel Register is used to close the relay strain gage multiplexer
internal channels and bridge completion channels.
base + 08
16
1514131211109876543210
Write Ch15
Int
Ch14
Int
Ch13
Int
Ch12
Int
Ch7
B_c
Ch6
B_c
Ch5
B_c
Ch4
B_c
Ch11
Int
Ch10
Int
Ch9
Int
Ch8
Int
Ch3
B_c
Ch2
B_c
Ch1
B_c
Ch0
B_c
Int, B_c Internal Channels and Bridge Completions Channels. The relay strain
gage multiplexer contains internal channels (Int) which access the
diagnostics, and bridge completion channels (B_c) to which the strain gages
are connected.
Closing Channels Closing a Channel. Writing a one (1) to bit 0 through 15 closes the
corresponding internal, or bridge completion channel. Writing a zero (0) to
the bit opens the channel.
Appendix D Strain Gage Register-Based Programming 125
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