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Bit 0. The attenuation relays (bits 15 - 11 and bits 7 - 3) are latching
relays. When energized, these relays will "latch" to an open (bit = 0) or
closed (bit = 1) state and remain in that state after the energizing power
is removed.
Bit 0 is used to energize the latching relays. Setting bit 0 to zero (0)
when setting the input attenuation energizes the relays. Setting bit 0 to
one (1) after the attenuation has been set, removes the energizing
source, thus, conserving power. Note that bits 15 - 11 and 7 - 3 should all
be set to 0 as bit 0 is set to 1.
The relays associated with bits 10 - 9 and bits 2 - 1 are not latching
relays. Therefore, when removing the energizing source (setting bit 0 to
’1’), these bits must be written to again to preserve their intended setting.
Register Descriptions Register-Based Programming C-11