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ChaPTer 4: moDBuS
ChapTer 4: Modbus
The Sentinel Pro can be configured to read up to 64 Modbus registers from any modbus device so that
you can create alarms, view the values over the internet, and record the values for trending purposes.
The Sentinel can read the values over 2-wire RS485 or Ethernet/TCP. You can also read registers from
both interfaces simultaneously, if desired. Once you have configured the unit to read the registers you
can create alarm set points, view the current values on the website, scale the value using multiplication
or division, add units of measure, and also record the values in the unit's datalogger.
readIng Modbus oVer rs485
To read values from a Modbus device over RS485 the Sentinel Pro must be the Modbus Master. All other
devices must be configured as Modbus Slaves. The Sentinel Pro can read from multiple slave devices
as long as the baud rate is the same among all connected devices and there are no overlapping register
addresses.
Connect the Sentinel Pro and your Modbus device(s) as shown in the figure below:
Sentinel
Modbus Devices
D +
D +
D +
D +
D –
D –
D –
D –
GND
GND
GND
GND
Termination
Termination
Termination
Termination
In
Out
Out
In
Connect the ground terminal (GND) on the Sentinel Pro RS485 terminal strip to the correspond-
ing ground or shield terminal on the Modbus slave device. Connect the Sentinel Pro RS485 Transmit/
Receive Positive (D+) terminal to the corresponding positive data terminal on the Modbus slave device.
Connect the Sentinel Pro Negative (D-) terminal to the corresponding negative data terminal.
Next, go to the Configure Device page on the Sensaphone.net website. Scroll down to the Modus RS-485
Settings and configure the parameters to match your Modbus device. See sample figure below:
Click the Save Changes button when finished.
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Need help?
Do you have a question about the Sentinel Pro and is the answer not in the manual?
Questions and answers
How do you add users?
To add users to Sensaphone Sentinel Pro:
1. Go to the "Manage Users" page.
2. Add alarm users to your account.
3. To group users, go to the "Manage user groups" section.
4. Select an existing group or click "Create New Group."
5. Give the group a unique, descriptive name.
6. Click the plus icon to add users from the list of alarm users.
7. You can add an entire user or select individual destinations.
8. Click the red X icon to remove users if needed.
9. Click "Save Group" when finished.
This answer is automatically generated