Smart Field Communicator; Figure 4 Typical Sfc Communication Interface - Honeywell ST 3000 User Manual

1.3

Smart Field Communicator

About SFC
communications
Purpose of SFC
8 ST 3000 Release 300 and SFC Model STS103 User's Manual
The portable, battery-powered SFC serves as the common communication
interface device for Honeywell's family of Smartline Transmitters. It
communicates with a transmitter through serial digital signals over the 4
to 20 milliampere line used to power the transmitter. A request/response
format is the basis for the communication operation. The transmitter's
microprocessor receives a communication signal from the SFC, identifies
the request, and sends a response message.
Figure 4 shows a simplified view of the communication interface provided
by an SFC.
Figure 4 Typical SFC Communication Interface.
ST 3000
The SFC allows you to adjust transmitter values, or diagnose potential
problems from a remote location such as the control room. You can use
the SFC to:
 Configure:
Define and enter the transmitter's operating parameters
including
– range values,
– output conformity,
– damping time,
– tag number (ID), and more
 Monitor:
Read the input pressure to the transmitter in
engineering units and the transmitter's output in
percent.
 Display:
Retrieve and display data from the transmitter or SFC
memory.
 Change Mode
of Operation: Tell transmitter to operate in either its analog (4-20
mA) mode or its digital enhanced (DE) mode.
Response
4 to 20 mA line
Request
Power
Supply and
Receiver
SFC
STR3001
Continued on next page
February 2012