def __init__(self, pvName=None, wait=True):
"""
Create an EPICS channel if pvName is specified, and optionally wait for connection.
:param str pvName: An optional name of an EPICS Process Variable.
:param bool wait: If wait is True and pvName is not None then this constructor will do a
:meth:`CaChannel.CaChannel.searchw` on the PV. If wait is False and pvName ist not None then
this constructor will do a :meth:`CaChannel.CaChannel.search` on the PV, and the user
must subsequently do a :meth:`CaChannel.CaChannel.pend_io` on this
or another :class:`epicsPV` or :class:`CaChannel` object.
"""
# Invoke the base class initialization
self.callBack = callBack()
CaChannel.__init__(self)
if pvName is not None:
if wait:
self.searchw(pvName)
else:
self.search(pvName)
