YZ Systems NJEX 8300G, Руководство пользователя, Страница: 30 / 126

YZ Systems, Inc. • 3101 Pollok Drive • Conroe, Texas • USA • 77303 • P: 936.788.5593 • F: 936.788.5720
Page 23 NJEX 8300 ver.092001 ATEX Rev.
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Y YY Y YSTEM STEM STEM STEM STEM
C C
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ONTR ONTR ONTR ONTR ONTROL OL OL OL OL
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Communications Interface
There are three methods of communicating information
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 communi-
cate with the NJEX system & obtain information, or
the NJEX system may be configured 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 converter for interface
with a SCADA system if required,
refer to the Wiring
Control Document on page 117in Appendix D
.
• Method 3, utilizes two output relays. One relay is for
Alarm Output, and provides single output communi-
cation 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 117in Appendix D.
Comm-Link Configuration
The 8300 system may be communicated to through
on one or two available RS485 communication ports.
The N-300 Modbus specification can be found in the
Appendix B, page 107.