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Configuration
Note
: An automatically added device has a default polling schedule, which is to poll as often as possible. If this
is not desirable then the Measurement Interval and Start Measurement setting need to be non-zero, see
section
Manually Adding SDI-12 Devices
for more information on these settings.
3.4.6
Modbus Devices
The Modbus Devices branch is used to configure devices that communicate via RS232, RS485 or Ethernet and are
connected to either of the Communication modules or via RS232, RS485 on the SSI port. A device can be a sensor (acting
as a slave) or the iRIS itself (when it is acting as a slave).
Name:
Enter a name for the Device (maximum 10 characters). This name will be displayed is used in
sensor configuration.
Serial Channel Source: This is the channel or physical interface that the device is attached, options are DBA
(DaughterBoard A), DBB (DaughterBoard B) and SSI.
Authority Role:
This is the Modbus Authority, when set to Master the iRIS will interrogate the devices. When
set to Slave the iRIS responds to the master device requests. For DBA and DBB modbus is only
supported for Cellurlar and Serial Dauthgerboards.
Only one Slave device can be configured, all others are set to Master.
Slave Address:
This is the address of the Modbus slave, when the Authority Role is set to Master, this address
is for the device connected to the iRIS. When the Authority Roll is set to Slave, this address is
the Modbus address of the iRIS.
Poll Interval:
Only Applies to Authority Roll Master: this is the interval that the iRIS will make requests to the
given device.
Start Offset:
Only Applies to Authority Roll Master: this offset the
POLL INTERVAL
. For example, if the Poll
Interval is 15 seconds and the offset is 5, then the iRIS will poll the device every 15 seconds
offset by 5 seconds, 00:00:05, 00:00:20, 00:00:35, 00:00:50, 00:01:05, 00:01:20, 00:01:35 …
23:59:35, 23:59:50.
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