Register Definitions B
E6198B Switch/Load Unit User Manual B-75
Card Configuration (R) Base + 1
h
Measurement matrix card configuration and firmware revision
(FWR) register. Initial firmware revision = 0
h
Status and Control (R/W) Base + 2
h
This register reads back the card's status. It can also be used to
Reset and Open All Relays (OAR).
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
h
Register offset 3
h
used only for placeholder to make software
addressing simpler.
Abus control and protection bypass relay (W) Base + 4
h
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.
• Writing to PB4-PB1 sets state of protection bypass relays.
• Writing to AB4-AB1, sets state of Abus disconnect relays.
Bits 7 6 5 43210
Read
FWR3FWR2FWR100000
Bits76543210
Read
Busy~ 0 OAR 0 X X X Reset
Bits76543210
Write
AB4 AB3 AB2 AB1 PB4 PB3 PB2 PB1
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