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The Sentry Controller Modbus RTU Communica-
tions Interface enables Sentry to easily communi-
cate with PC based Distributed Control Systems
and graphic based human-machine interfaces and
via the FieldServer Technologies gateway to a wide
range of other protocols.

The Sentry system from Sierra Monitor offers comprehen-
sive, cost effective solutions to many specific gas man-
agement requirements.  From a simple 4-point monitoring
system to a complete plant wide hazardous gas monitor-
ing system with hundreds of gas detection points, Sentry
meets the need.

With the Modbus communications interface Sentry can
easily interface with a PC-based Distributed Control Sys-
tem to provide a graphical display of hazardous gas condi-
tions in the plant.  PC-based DCS software in conjunction
with Sentry provides the operator enhanced data acquisi-
tion, alarming and alarm management, historical trending,
distributed architecture, and integration into the plant’s dis-
tributed control system.

Sentry’s Modbus communication interface provides over
620 different parameters accessible by the PC-based DCS
software, including:

gas concentration

alarm setpoints

sensor diagnostic messages

historical reset time/date

power up/down time/date

trouble alarm time/date

minimum/maximum values plus time/date

high/low alarm latch/non-latched

auto calibration enabled

calibration status/coefficients

calibration concentrations

calibration due date

zone option enabled

operate mode

Using the optional FieldServer Technologies Gateway the
user can convert from the Modbus RTU output to a wide
variety of other protocols including DF1, DH+, Profibus,
Modbus TCP, ControlLogix and many more.

FieldServer Technologies is a division of Sierra Monitor Cor-
poration. More information on FieldServer products can be
found at www.fieldserver.com

Ordering Information

5387-50 Modbus Communications Interface
4301-10 Converter RS-232/RS-485, 9VDC

Sierra Monitor Corp.  1991 Tarob Ct., Milpitas, CA 95035, USA, 408-262-6611,  800-727-4377,  FAX: 408-262-9042

Web Site:  http://www.sierramonitor.com           E-Mail:  [email protected]

© 2009 by Sierra Monitor Corporation

Sentry

Modbus Communications Interface

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