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Product Data Document
420DS-7d / D301312X012
January 29, 2009 - Page 12
Bristol
®
ControlWave ExpressPAC
Remote Automation Solutions
Website: www.EmersonProcess.com/Remote
ControlWave Open Network Connectivity
By embracing the open system network technolo-
gies available through TCP/IP, Ethernet, OPC, and
Microsoft DNA, as well as pseudo standards such
as Modbus and Open Modbus, ControlWave can
provide a total Process Automation Management
Solution for in-plant LAN based networks and Wide
Area Network SCADA systems.
With the exceptional connectivity provided by the
ControlWave network, access to real-time data and
operating conditions, historical data, maintenance
and performance data are all available to the global
network. ControlWave provides the needed informa-
tion to the plant oor technician, operator, engineer,
supervisor and corporate management, even exter-
nal customers.
Communication Protocols
Like all of Emerson’s Bristol products, ControlWave
supports BSAP (Bristol Standard Asynchronous
Protocol), Modbus, DFI, CIP, DNP3, and serial
ASCII as standard functions.
These protocols are implemented in Flashware so
no additional hardware is required to use any one or
a combination of all protocols.
BSAP Protocol
BSAP - All of Emerson’s Bristol Network 3000 and
ControlWave RTU and controller products support
BSAP protocol. BSAP is widely accepted as provid-
ing exceptional data integrity and greatly simpli-
es communication between controllers. BSAP is
provided with interfaces for Master/Slave, vertical
networks, and Client/Server, horizontal networks. In
either case, variable lists are created in each con-
troller that are easily passed from server to client or
slave to master.
BSAP meets the denition of an industry-standard,
open architecture protocol because if conforms to
ISO standards 2629, 1745 and 2111, it is not propri-
etary in that Emerson does not charge a license fee
and makes the protocol and documentation avail-
able to anyone.
While BSAP is an open protocol, the added func-
tionality of the messages provide much more capa-
bility than is found in other networks.
Global time-synchronization•
Time-stamped Alarm reporting•
Historical archive data transfer•
Audit le transfer•
On-line program editing•
Diagnostics•
Communication statistics•
Modbus Protocol
Modbus - Modbus is often considered a de-facto
standard protocol because of its broad usage as
either the primary or a secondary offering in many
measurement and control related products. Even
with its common use, Modbus protocol actually
has many variations. Consider Modbus RTU and
Modbus ASCII, Master & Slave, Serial and TCP/IP
Open Modbus. In addition there are considerations
regarding supported function codes, oating point
values and byte order. Bristol products support the
following:
Modbus serial and TCP/IP Open Modbus •
(Ethernet)
Master and Slave•
Modbus RTU and ASCII•
Modes 1 - 7, 8, 15 & 16•
IP modes 51, 52 & 53•
Integer and IEEE 4 byte oating point •
Generic Serial Interface
The Generic Serial Interface is a user program-
mable Master and Slave protocol used to send and
receive messages typically with third party serial
ASCII devices. This protocol can be used to inter-
face with such devices and message boards, card
readers and many measurement devices.