Bristol Babcock Network 3000 Setup Manual page 48

Chapter 4 - Guidelines For Configuring the BSAP Data Link
The actual character-by-character movement of data is governed by the baud rate.
The baud rate specified on a master node's master port must match the baud rate
for each slave on that communication line.
When all of these data link parameters are configured correctly, data moves from a
slave node, to its master, to the master's master, etc., until it reaches the network
master computer, where it may viewed by the operator, exported to HMI/SCADA
packages, etc.
This section will discuss data link parameters which specify how this movement of
data will occur. These parameters include:
Proper configuration of the Master Port or Expanded Addressing Master Port(s)
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if this is a Master node including: baud rate, high slave addresses, timeouts, as
well as setting the proper poll period for the port(s), and defining the node array
(#NDARRAY..)
Proper configuration of the Slave Port, if this is a Slave node, including the baud
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rate and the poll period for the slave.
Proper configuration of the Network Master (usually a PC workstation)
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including baud rates, retries, etc.
Special considerations concerning radios, modems, etc.
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Setting Up the Master Port(s)
Master Port configuration should be performed prior to configuring other port types.
It involves defining the port in the ACCOL source file, setting the poll period for the
port, and setting up the #NDARRAY to control polling of slave nodes.
Master Port Definition in the ACCOL source File
A controller's Master Port(s) are configured within the ACCOL source file.
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If you are using one or more Expanded Addressing Master Ports, the same instructions generally
apply. Specific differences will be noted in footnotes.
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Network 3000 Communications Configuration Guide