ST-72 User's Manual
Document: UM-1007
Revision Level A
38
2.5.1
COM 1-4 SETTINGS
The four Modbus RS-485 ports can be individually configured multiple ways using the
following menus.
COM2 Settings
COM3 Settings
COM4 Settings
ModbusTCP Settings
Network Settings
Troubleshooting
COM1 Settings
~
~
~
~
~
~
~
Communication Settings
BaudRate
Parity
Timeout (ms)
Poll Delay (ms)
Sympathy Enabled
Radio Setup
Function
9600
None
500
250
No
~
Modbus Master
COM1 Settings
COM1-4 Menus are Identical
Figure 2-23
2.5.1.1 FUNCTION
The Function parameter allows the communication ports to be set as
Modbus Master,
Modbus Slave, Wireless Monitor, Redundant Port,
or
Disabled.
2.5.1.1.1
Modbus Master
Master mode allows the communication port to poll any device using the Modbus RTU
protocol. This setting is also utilized for Wireless Modbus Master.
2.5.1.1.2
Modbus Slave
Slave mode allows the communication port to be polled by any Modbus Master device
using the Modbus RTU protocol. This setting is also utilized for Wireless Modbus Slave.
2.5.1.1.3
Wireless Monitor
This mode is exclusively for wireless communication to our ST-48/RF wireless sensor
transmitters (please visit
2.5.1.1.4
Redundant Port
This setting allows the user to create a redundant port which uses the settings from
another port that is already configured. Redundant mode works with ports configured
as
Modbus Master
. When configured as a redundant port, the
Primary
port
communicates until it gets a communication error. The ST-72 then switches to the
redundant port and continues to poll the slave nodes. When communication has
switched to the redundant port the ST-72 trips the
Fault
relay, beeps, and displays a
warning telling the user there has been a communication error. The user is able to
Ignore
the warning for 12 hours or
Test
the
Primary
port. Ignoring the problem gives
Содержание ST-72
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Страница 128: ...ST 72 User s Manual Document UM 1007 Revision Level A 122 8 5 3 COPY CHANNELS Figure 8 7...
Страница 129: ...ST 72 User s Manual Document UM 1007 Revision Level A 123 8 5 4 PROGRAMMABLE RELAYS Figure 8 8...
Страница 130: ...ST 72 User s Manual Document UM 1007 Revision Level A 124 8 5 5 SYSTEM CONFIGURATION Figure 8 9...