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The WRITE
Registers
Control Register
base + 04
15
14
16
Write
CRD RST
Tree Switch
Register
base + 06
15
14
16
Write
Closing Tree Relay
Channel Register
base + 08
15
14
16
Write
Ch15
Ch14
Ch13
Int
Int
Int, B_c
Closing Channels
Appendix D
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The following WRITE registers are located on the relay strain gage
multiplexers:
•
Control Register (base + 04
•
Tree Switch Register (base + 06
•
Channel Register (base + 08
The Control Register on the relay strain gage multiplexer is used to reset the
multiplexer to its power-on state (all channels open).
13
12
11
10
9
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.
The relay multiplexer's Tree Switch Register controls tree relays 93, 92, 91,
and 90.
13
12
11
10
9
Undefined
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).
The Channel Register is used to close the relay strain gage multiplexer
internal channels and bridge completion channels.
13
12
11
10
9
Ch12
Ch7
Ch6
Ch5
Int
Int
B_c
B_c
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 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.
)
16
)
16
)
16
8
7
6
5
Undefined
8
7
6
5
8
7
6
5
Ch4
Ch11
Ch10
Ch9
B_c
Int
Int
Int
Strain Gage Register-Based Programming
4
3
2
1
CRD
RST
4
3
2
1
93
92
91
90
4
3
2
1
Ch8
Ch3
Ch2
Ch1
Ch0
Int
B_c
B_c
B_c
B_c
125
0
0
0
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