7
Signametrics
1.4 Configuration Relays
In addition to the channel switching relays, the SMX4032 includes two sets of relays used for configuring of the
scanner. The configuration switches facilitate inter-group connections and the Tree relays provide isolation of each
of the group’s buses from their respective channel relays. These relays are automatically configured on the fly when
the scanner receives configuration commands or while a channel is being selected, which requires routing via these
relays. In cases where the pre-defined configurations (
TwoWire, FourWire, SixWire, TwoGroups,
and
FourGroups
)
do not meet the test needs, select the
Universal
configuration. It allows an unlimited control of any of the channel,
configuration and tree relays independently. Care must be taken however, since it does not offer the protection of
the predefined configurations. This could result in shorting some “hot” lines, constituting in potential hazard to the
user from any thing that is connected to the scanner and from the scanner itself. This could also lead to damaging
the scanner or anything connected to it. It may also present an electricution hazard.
1.5 Self Test and Contact Cleaning
In addition to the channel relays, Tree relays and Configuration relays, there are additional relays and circuit
components that handle the various tests built into the Scanners. The user does not have direct control over these
components.
The test connector is useful in various self tests and cleaning operations of the Scanner. It is a Female DB-78
position connector which has 32 shorts across all Channels (Ch1Hi shorted to Ch1Lo etc.), and three shorts across
the B-Bus/Ch33, C-Bus/Ch34 and D-Bus/Ch35. All other terminals, including the A-Bus must be left open. This
test connector is optionally available from Signametrics as SMX40L.