PRTG Manual: Modbus RTU Custom Sensor
The Modbus RTU Custom sensor connects to a Modbus Remote Terminal Unit (RTU) server and monitors up to ten returned numeric values.
For a detailed list and descriptions of the channels that this sensor can show, see section Channel List.
- Dutch: Modbus RTU Aangepast
- French: Modbus RTU personnalisé
- German: Modbus RTU (Benutzerdefiniert)
- Japanese: Modbus RTU カスタム
- Portuguese: Modbus RTU customizado
- Russian: Пользовательский Modbus RTU
- Simplified Chinese: Modbus RTU 自定义
- Spanish: Modbus RTU (personalizado)
- You can create this sensor only on a probe device.
- This sensor supports IPv6.
- This sensor has a very low performance impact.
- This sensor uses lookups to determine the status values of one or more channels.
- This sensor always uses the serial port of the probe device.
- Knowledge Base: How can I apply Zoom Service Status sensors and Modbus sensors via device templates?
You cannot add this sensor to the hosted probe of a PRTG Hosted Monitor instance. If you want to use this sensor, add it to a remote probe device.
Setting |
Description |
---|---|
Channel #1 - #10 Name |
Enter a name for the channel. You can change this value later in the channel settings of this sensor. |
Channel #1 - #10 Unit |
Enter a unit for the channel. You can change this value later in the channel settings of this sensor. |
Channel #2 - #10 |
You can define up to 10 channels. You must define at least one channel, so you see all available settings for Channel #1. Specify how to handle all other possible channels:
It is not possible to enable or disable channels after sensor creation. |
Setting |
Description |
---|---|
Sensor Name |
Enter a name to identify the sensor. By default, PRTG shows this name in the device tree, as well as in alarms, logs, notifications, reports, maps, libraries, and tickets. If the name contains angle brackets (<>), PRTG replaces them with braces ({}) for security reasons. For more information, see the Knowledge Base: What security features does PRTG include? |
Parent Tags |
The tags that the sensor inherits from its parent device, parent group, and parent probe. This setting is for your information only. You cannot change it. |
Tags |
Enter one or more tags. Confirm each tag with the Spacebar key, a comma, or the Enter key. You can use tags to group objects and use tag-filtered views later on. Tags are not case-sensitive. Tags are automatically inherited. It is not possible to enter tags with a leading plus (+) or minus (-) sign, nor tags with parentheses (()) or angle brackets (<>). For performance reasons, it can take some minutes until you can filter for new tags that you added. The sensor has the following default tags that are automatically predefined in the sensor's settings when you add the sensor:
|
Priority |
Select a priority for the sensor. This setting determines the position of the sensor in lists. The highest priority is at the top of a list. Choose from the lowest priority () to the highest priority (). |
Setting |
Description |
---|---|
Device COM Port |
Enter the component object model (COM) port of the serial port device. On Windows systems, the COM port of the device looks like this, for example: COM3. |
Baud Rate |
Enter the speed of the serial connection in baud. The default baud rate is 9600. |
Parity |
Select the parity of the serial connection:
|
Data Bits |
Select the number of the data bits of the serial connection:
|
Stop Bits |
Select the number of stop bits of the serial connection:
|
Retry Attempts |
Enter the number of retries until a timeout occurs. If you enter 0, the sensor does not retry the communication attempt. The default value is 3. Enter an integer. |
Receive Timeout (msec) |
Enter a receive timeout in milliseconds (msec). If the reply from the device takes longer than this value, the request is aborted and triggers an error message. The default value is 500 msec (0.5 seconds). |
Unit ID |
Enter the Modbus unit ID that you want to monitor. In a standard Modbus network, there are up to 247 unit IDs, each with a unique assigned identifier from 1 to 247. |
Byte Order |
Select the sequence of the transmitted information:
|
Setting |
Description |
---|---|
Channel #1 - #10 Register Type |
Select the type of the register:
After sensor creation, this setting shows the register type of the channel value. |
Channel #1 - #10 Register Number |
Enter the register number from which you want to retrieve information. The register number must be a number that contains one to five digits. The sensor supports numbers between 0 and 65534. Depending on your Modbus device, you might need to remove the register type prefix. For example, you need to enter 60 for the input register 30060 or 316 for the holding register 40316. |
Channel #1 - #10 Value Type |
This setting is only visible if you select Input register or Holding register above. Select the value type that the channel displays:
This mode only works if the difference between the last and the current value is positive and increases with each scanning interval. This mode does not support negative values and decreasing values. |
Channel #1 - #10 Data Type |
This setting is only visible if you select Input register or Holding register above. Select the data type of the register:
You cannot change this value after sensor creation. |
Channel #1 - #10 Register Width |
This setting is only visible if you select Input register or Holding register above. Select the width of the value in the register:
|
Channel #1 - #10 Bit Index |
This setting is only visible if you select Input register or Holding register above. Enter the index of the bit that you want to monitor. Enter a value between 0 and 15, 31, or 63, depending on the Channel #1 - #10 Register Width. 0 monitors the least significant bit. To monitor the most significant bit, enter 15 for a 16-bit register, 31 for a 32-bit register, or 63 for a 64-bit register. |
Setting |
Description |
---|---|
Primary Channel |
Select a channel from the list to define it as the primary channel. In the device tree, the last value of the primary channel is always displayed below the sensor's name. The available options depend on what channels are available for this sensor. You can set a different primary channel later by clicking below a channel gauge on the sensor's Overview tab. |
Graph Type |
Define how different channels are shown for this sensor:
|
Stack Unit |
This setting is only visible if you select Stack channels on top of each other above. Select a unit from the list. All channels with this unit are stacked on top of each other. By default, you cannot exclude single channels from stacking if they use the selected unit. However, there is an advanced procedure to do so. |
Setting |
Description |
---|---|
Result Handling |
Define what PRTG does with the sensor result:
This option is not available when the sensor runs on the hosted probe of a PRTG Hosted Monitor instance. In a cluster, PRTG stores the result in the PRTG data directory of the master node. |
By default, all of these settings are inherited from objects that are higher in the hierarchy. We recommend that you change them centrally in the root group settings if necessary. To change a setting for this object only, click under the corresponding setting name to disable the inheritance and to display its options.
For more information, see section Inheritance of Settings.
For more information, see section Root Group Settings, section Scanning Interval.
Schedules, Dependencies, and Maintenance Window
You cannot interrupt the inheritance for schedules, dependencies, and maintenance windows. The corresponding settings from the parent objects are always active. However, you can define additional schedules, dependencies, and maintenance windows. They are active at the same time as the parent objects' settings.
For more information, see section Root Group Settings, section Schedules, Dependencies, and Maintenance Window (default).
For more information, see section Root Group Settings, section Access Rights.
Which channel units are available depends on the sensor type and the available parameters. If no configurable channels are available, this field shows No configurable channels.
For more information, see section Root Group Settings, section Channel Unit Configuration.
Which channels the sensor actually shows might depend on the target device, the available components, and the sensor setup.
Channel |
Description |
---|---|
Downtime |
In the channel table on the Overview tab, this channel never shows any values. PRTG uses this channel in graphs and reports to show the amount of time in which the sensor was in the Down status |
[Value] |
The returned numeric values in up to ten channels |
KNOWLEDGE BASE
How can I apply Zoom Service Status sensors and Modbus sensors via device templates?
What security features does PRTG include?