Sierra Monitor Corporation Carbon Monoxide Alarm Modbus Communications Interface User Manual

Sentry  
Modbus Communications Interface  
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.  
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.  
Sentry’s Modbus communication interface provides over  
620 different parameters accessible by the PC-based DCS  
software, including:  
FieldServerTechnologies is a division of Sierra Monitor Cor-  
poration. More information on FieldServer products can be  
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  
Ordering Information  
5387-50 Modbus Communications Interface  
4301-10 Converter RS-232/RS-485, 9VDC  
zone option enabled  
operate mode  
Sierra Monitor Corp. 1991 Tarob Ct., Milpitas, CA 95035, USA, 408-262-6611, 800-727-4377, FAX: 408-262-9042  
© 2009 by Sierra Monitor Corporation  
 

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