Installation and Start-Up | 3-23
Conguring the Hardware for Digital Communication
The 9-pin D-sub connector, located on the Termination board, is an
RS-232 serial port (J106, Figure 3-3). The port is principally intended as
a temporary connection that can be used to configure and service the
analyzer. The maximum length for a typical cable used for RS-232 commu-
nications is 50 feet; if the length will exceed this, the cable must be a low
resistance shielded cable.
Access to this port is available only if the Electronics Enclosure cover
is open.
Before opening the cover, test the area around the analyzer for explo-
sive gases and proceed only when the area is found to be safe.
When the Electronics Enclosure is open, take appropriate precautions
to avoid electrical shock. Hazardous voltages are present inside.
The pin out for the 9-pin D-sub connector is:
Pin Number Signal Connection
2 RS-232 RX
3 RS-232 TX
5 RS-232 GND
There are also other serial port connections available for permanent con-
nection on the Customer Connection terminals.
IMPORTANT
During installation, route cable from the RS-485 connector into a
non-hazardous location. This will allow easier communications with
the analyzer in the future.
The terminal connections are for digital communications which can be
used to service and troubleshoot the analyzer. There are three terminals
for RS-232 connections and four terminals for RS-485 connections. The
various serial port configurations and cabling requirements between
a computer or Distributed Control System (DCS) and the analyzer are
detailed in a supporting document, the Model 241CE II Analyzer Serial
Communication Interface (Modbus) Manual Supplement.
NOTE
!
WARNING
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