Register Definitions B
E6198B Switch/Load Unit User Manual B-59
Not Used Base + 3
h
Abus control and protection bypass relay (W) Base + 4
h
Pin 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.
• Writing to PB
4
-PB
1
sets state of protection bypass relays.
• Writing to AB
4
-AB
1
, when the Status/Control register
manual bit is set to 1, sets state of Abus disconnect relays.
• Writing to AB
4
-AB
1
, when Status/Control register manual bit
is set to 0, does not change the state of the disconnect relays.
Not Used Base + 5
h
The only difference between OAR and Reset is OAR leaves the state of
“Manual” the same. “Reset” clears the "Manual" setting.
Register offset 3
h
used only for a placeholder to make software
addressing simpler.
Bits76543210
Write
PB
4
PB
3
PB
2
PB
1
AB
4
AB
3
AB
2
AB
1
When the manual bit is set to 0, writing to this register puts new relay
settings into a “on board” latch. These settings have no impact on the
state of the disconnect relays as long as the “manual” bit is set to 0.
However if the manual bit is set back to 1, the disconnect relay state
written to this register will immediately be invoked, resulting in a
immediate change in the state of the disconnect relays.
Register offset 5
h
used only for a placeholder to make software
addressing simpler.
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