IDN 98 (S-0-0098) Class 3 Diagnostic Mask

A mask for the C3D ( IDN 13 ). When a status condition within IDN 13 changes state, the C3D change bit (AT status word, bit 11) is set. The status bits within IDN 13 are not latched (i.e., they will automatically set or reset as status conditions change). The C3D change bit is reset when IDN 13 is read through the service channel. IDN 98 may be used to mask the effect of a particular status condition on the C3D change bit: when a masked status changes state, the C3D change bit will not be set. However, the status bits in IDN 13 will continue to change state according to the status conditions. When a bit in IDN 98 is clear, the corresponding bit in IDN 13 is masked.