PN 903-8797, Rev A
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 2-3). The port is principally intended as a temporary
connection that can be used to congure and service the analyzer. The maxi-
mum length for a typical cable used for RS-232 communications 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 connec-
tion 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
congurations and cabling requirements between a computer or Distributed
Control System (DCS) and the analyzer are detailed in a supporting docu-
ment, the 241CE II Analyzer Serial Communication Interface (Modbus) Manual
Supplement.
Installation and Start-Up | 2-23
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