  We analyze the operation of a four-qubit Bacon-Shor code with simultaneous
continuous measurement of non-commuting gauge operators. The error syndrome in
this case is monitored via time-averaged cross-correlators of the output
signals. We find the logical error rate for several models of decoherence, and
also find the termination rate for this quantum error detecting code. The code
operation is comparable to that based on projective measurements when the
collapse timescale due to continuous measurements is an order of magnitude less
than the time period between the projective measurements. An advantage of the
continuous-measurement implementation is the absence of time-dependence in the
code operation, with passive continuous monitoring of the error syndrome.
