Revision 1 18 9/10/2019
2.3.2 Display Board Communication Ports
The system has two distinct communications ports housed on the display board. A USB/RS-
232 port is located on the right side of the display board. A pair of switches that can be set for
USB or RS232 communications is located on the reverse side of this board on the bottom left
hand corner. By default, the switch is set for USB usage.
A RJ-9/22 jack that can also be used for RS232 communications is located directly under the
LCD Display. There are jumpers located on the bottom left hand corner of the CPU board that
need to be set if this jack is to be used or if the Ethernet card is used. The Ethernet Card
option and the RJ-9/22 jack cannot be used simultaneously.
2.4 Inner Swing Panel
The inner swing panel contains all of the mechanical parts of the system including the tape-
advance motor, the pulse counter used to accurately advance the tape, the sensing tape
spool, and the components related to the actual flow of sample gas and the measurement of
the concentration of phosgene in the sample gas stream. A photo of the swing panel is
shown in Figure 2-2.
Figure 2-2: Swing Panel
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