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E6198B Switch/Load Unit User Manual
Card Configuration (R) Base + 1
Measurement matrix card configuration and firmware revision
(FWR) register. Initial firmware revision = 0
Bits
7
Read
FWR3
Status and Control (R/W) Base + 2
This register reads back the card's status. It can also be used to
Reset and Open All Relays (OAR).
Bits
7
6
Read
Busy~
0
Read Only:
• Busy~: 0 indicates busy, 1 indicates not busy.
Write and Read Bits:
• OAR: 0 causes no change, 1 causes all relays to open.
• Reset: 0 causes no change, 1 causes board reset and triggers
the relay timer. Clears itself afterward.
Not Used Base + 3
Register offset 3
addressing simpler.
Abus control and protection bypass relay (W) Base + 4
Measurement matrix card Abus and protection bypass relay
control register. All relay control registers are positive-true
logic: writing 0 opens the relay and writing 1 closes the relay.
Bits
7
AB4
Write
• Writing to PB4-PB1 sets state of protection bypass relays.
• Writing to AB4-AB1, sets state of Abus disconnect relays.
h
6
5
FWR2
FWR1
h
5
4
3
OAR
0
X
h
used only for placeholder to make software
h
6
5
4
AB3
AB2
AB1
Register Definitions
h
4
3
2
1
0
0
0
0
2
1
X
X
Reset
h
3
2
1
PB4
PB3
PB2
B
0
0
0
0
PB1
B-75
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