Product Data Document
420DS-4c
July 19, 2007 - Page 10
Bristol
®
ControlWave
®
LP
Remote Automation Solutions
Website: www.EmersonProcess.com/Remote
Communication Protocols
Like all Emerson products, ControlWave supports
BSAP (Bristol Standard Asynchronous Protocol),
Modbus, DF1 and serial ASCII as standard func-
tions. These protocols are implemented in flash
-
ware so no additional hardware is required to use
any one or a combination of all protocols.
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-
fies 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 definition 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 passed provide much
more capability than is found other networks.
Global time-synchronization
Time-stamped Alarm reporting
Historical archive data transfer
Audit file transfer
On-line program editing
Diagnostics
Communication statistics
Modbus - Modbus is often considered a de-facto
standard protocol because broad usage as ei-
ther 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 &
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Slave, Serial and TCP/IP Open Modbus. In addi-
tion there are consideration regarding supported
function codes, floating point values and byte order.
Emerson’s Bristol products supports 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 floating point
Allen Bradley DF-1
DF-1 protocol is the primary mechanism to inter-
face to Allen Bradley PLCs and interface devices.
ControlWave and Network 3000 both support DF-1
half-duplex master protocol.
Generic Serial Protocol
The Generic Serial Protocol is a Master and Slave
protocol used to send and receive messages typi-
cally with third party serial ASCII devices. This
protocol can be used to interface with such devices
and message boards, card readers and many mea-
surement devices.
Multi-User Security Access
Security is an essential element of any open
system, particularly those with Internet access.
ControlWave employs a User Name/Password ac-
cess system protected by a 56-bit encryption tech-
nique through the TCP connection. There can be up
to thirty-two users, who sign-in using their name and
password. Both the name and the password can be
up to sixteen characters.
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