Communication Ports - Allen-Bradley 857 Quick Start Manual

Chapter 3 Local Panel User Interface

Communication Ports

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The 857 has three standard communication ports, "Remote", "Local" and
"Extension". A fourth optional Ethernet port is available. The Ethernet port
can also support the IEC 61850 standard if the Protection System is ordered
with this capability. A maximum of two communications interface options can
be operating at any given time. Communication modules are specified at the
time of order placement and are not exchanged in the field or replaceable.
These ports must be configured for the specific communications interface and
protocol being utilized as the main means of communicating to the Protection
System.
The front communications connection is used for connection to a personal
computer. The connection is used for setting the Protection System
parameters, and for the interrogation of information from the Protection
System, including disturbance recordings. The front panel connection is
associated only with the Local Port settings in the Protection System.
For setting the Protection System parameters by using the SetPointPS software
through the front connection, a special cable, part number 857-VX003, is
required for connection to a computer.
Once this cable is connected to the front of the Protection System, it associates
the connection of the personal computer to the Local Port on the Protection
System. This port must be configured in coordination with the settings of the
SetPointPS software, the personal computer serial port (if equipped), or a USB
to serial port adapter.
The default settings in the Protection System, for this communications
method are shown in the following table.
Description
Communication rate
Parity
Stop Bits
Verify that these communications settings are the same for the personal
computer serial or USB to Serial converters.
You can verify these settings in the Protection System by pushing and/or
holding the DOWN button until you reach the "BUS" location.
Push the RIGHT arrow button to scroll to the right to interrogate the Local
Port settings.
Rockwell Automation Publication 857-QS001B-EN-P - April 2017
Default Setting
38,400
N
1