YZ Systems NJEX 7300L, Instructions & Operating Manual, Page: 33 / 126

YZ Systems, Inc. • 3101 Pollok Drive • Conroe, Texas • USA • 77303 • P: 936.788.5593 • F: 936.788.5720
Page 23 NJEX 7300L ver.09042003
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C C
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Communications Interface
There are three methods of communicating informa-
tion out of the N-300 controller.
• Method 1, utilizes Communications Modbus
protocol. Specifications to permit configuration can
be found in
Appendix B, page 107 .
• Method 2, utilizes the Sentry Software installed on
a computer. In this mode the computer can
communicate with the NJEX system & obtain
information, or the NJEX system may be config-
ured to notify the computer and provide it with
information.
• Connections for Method 1 or 2 are via an RS-485
two wire connection. In a safe, nonhazardous
area this may be connected to a RS-232 con-
verter for interface with a SCADA system if
required,
refer to the Wiring Control Document on
page 116 in Appendix D .
• Method 3, utilizes two output relays. One relay is
for Alarm Output, and provides single output
communication to indicate some type of some
alarm has occurred with the odorizer. The second
output relay is for a Scaled Pulse relative to a
programed volume of odorant injected by the
system,
refer to the Wiring Control Document on
page 116 in Appendix D.
Comm-Link Configuration
The 7300L system may be communicated to
through on one or two available RS485 communica-
tion ports.
The N-300 Modbus specification can be found in the
Appendix B, page 107.