P/N 134421
2
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
SureCross™ DX80 Web Configurator
Instruction Manual
RF Devices Tab
DX80 Gateway is Modbus RTU Master
When a DX80 Gateway is set up as a Modbus RTU master device, the communication between the
DX83 Ethernet Bridge (used to configure the network) and the Gateway is ignored. The Gateway
acts as the Modbus RTU master device for the system, which may include other slave Gateways or
DX85 Remote I/O slave devices. All communication must go through the master device.
The master table entries define the register-to-register communication for remote I/O points. Each
line represents a register/point connection between the master device and a Modbus slave device
with up to 32 table entries possible. For each table entry, specify the local Modbus register, action
to perform, type of external point, external register number, external slave number, and a Modbus
timeout value for that register access. Active threshold and hysteresis are optional parameters that
may be applied to registers.
After making changes, click on the Change button to send the changes to the DX83 Ethernet Bridge
or the Gateway Pro. Click on the Send button to send these changes to the radio devices. To save
the changes to the XML file, go to the
System > Setup > Config File
page and click the Save button.
Action: Select an action from the following: None, Reads From, or Writes To. Select
None
to
perform no action,
Reads From
reads the parameter from the remote register and copies the
contents into the local register, and
Writes To
writes the data from the local register to the remote
register.
Hysteresis and Threshold: The threshold defines a trigger point or reporting threshold (ON point)
for an analog input. Enter a 0 to turn off the threshold, otherwise use a specific value, e.g. 15 mA for
a 0-20 mA analog input. Threshold and hysteresis work together to establish the on and off points of
an analog input.
The hysteresis value establishes how much
below the active threshold (ON point) an
analog input is required to be before the input
is considered off. When set to 0, hysteresis is
turned off. A typical hysteresis value is 10%
to 20% of the unit’s range. In the example
given above, the input is considered on at
15 mA. To consider the input off at 13 mA,
set the hysteresis to 2 mA. The input will be
considered off when the value is 2 mA less
than the threshold.
Local Register: The Local Register entry
is the
from
register in the I/O mapping. I/O
points are linked from the local register to the
remote register.
Map #: Each map entry is defined with a map number, one through 32. The master table entries de-
fine the register-to-register communication for remote I/O points. Each line represents a register/point
connection to another Modbus slave device. Up to 32 table entries are possible.
Poll Timeout: The poll timeout refers to the time limit, in milliseconds, to communicate with a specific
slave device. When this time limited is exceeded, the system begins communicating with the next
device in the table. The Poll Timeout setting prevents the system from stopping when a slave device
is not responding.
Remote Register: The Remote Register entry is the
to
register in the I/O mapping. I/O points are
linked from the local register to the remote register.
Remote Type: Select a type from the following drop-down list: none, coil (output), discrete input,
input register, or holding register. DX80 device registers are all holding registers.
Threshold
On point
Time
Input Value
Input
Hysteresis point
Off point