Anatel A643a - Instrument Installation 33 of 220
RPS - June 2007 - Edition 12
Anatel Operator Manual
2.3.3 Communications Connections
Communications are established by making the necessary connections between an Anatel
A643a Analyzer and its associated C80 Controller. Because the Controller is an integral
component on the Anatel A643a–P, communications are internal to that model.
The 3-foot local cables, twin BNC tee connectors, passive terminators and 10-foot trunk cable
were all checked during the verification procedure and should only have to be reconnected in
order to establish communications. The cable’s twist-lock fittings facilitate the quick and easy
connection and disconnection of any Anatel A643a system component for installation,
relocation or repair.
The C80–Anatel A643a–S interface must be configured as a single trunk line with local cabling
no longer than three feet in length, although the trunk line can extend a total of 3000 feet (not
including local cable drops). If electrical interference may be a problem, the interface cable
should be installed in conduit which is free from other wiring or AC buses. Active (AC-powered)
termination is required for trunk lines longer than 500 feet in order to control noise and help
ensure a clean communications signal.
To establish interface communications between the C80 Controller and Anatel A643a
Analyzer:
1) Grasp the end of the 3-foot local cable attached to the C80 Controller and, noting the
alignment of its internal pins, gently push it onto the middle coupling of the tee
connector. Twist the cable onto the connector until it “locks” on the coupling.
2) Similarly fasten the Analyzer to its tee connector.
3) Link the two tee connectors using the section of trunk cable.
4) The passive terminators (P/N FG2005901) provided with each System component
should be fastened to the open coupling at each end of the trunk cable.
Trunk cabling longer than 500 feet requires active termination. In these longer installations,
an AC-powered terminator (PN FG2006501 – 120VAC, FG2006601 – 230VAC) must be
connected to the open coupling at one end of the cable, then plugged into an appropriate
AC source. A passive terminator should be installed on the other end of the trunk cable.
2.3.3.1 Auxiliary Inputs & Outputs
All of the Analyzer’s auxiliary input and output connections are made on its integral I/O
Connector Block. This standardized Connector Block provides a consistent and flexible
means of interfacing Anatel A643a Analyzers with a variety of other devices. External wiring
connections are made by removing the entire I/O Connector Block from the bottom of the
Analyzer and wiring each I/O cable to the appropriate screw terminals. The connector type and
gender of the other end of the cable is determined by the auxiliary device to which it is attached.
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