Modbus Server Setup
Adding a Modbus Server
Acquire™ can pass information from the flowcomputers to other Modbus devices using a Modbus server.
To setup a modbus server:
- Select 'Modbus Servers' from the 'Config' menu.
This will bring up the list of configured Modbus servers:
To add a new modbus server:
- Click the 'Add' button
This will display the settings screen for the Modbus server:
Specify the fields as follows (using the TCP protocol):
| Field | Description |
| Location | This is the name used to identify the Modbus server. |
| Protocol | The Modbus server can be set to run either using Modbus TCP or Modbus Serial. The protocol selected will affect some of the other parameters that appear on this screen. |
| Mode | The mode selects between using Modbus RTU or Modbus ASCII. Profile always uses Modbus TCP for Ethernet connections. |
| Slave ID | This is the slave address that the Modbus server will use. |
| Server Mode | |
| IP Address | This is the IP address that the Modbus server will respond on. The IP address entered must be one of the server`s own allocated IP addresses. Alternatively if there is only one Modbus server on the system you can use the local host address 127.0.0.1 |
| Port | This is the port that the Modbus server is connected to |
| Timeout (secs) | This is the time in seconds that Acquire™ will wait for an incoming request. If a request does not occur in this time, the server will disconnect the connection. |
| Streams | This is the amount streams the Modbus server will have. |
| Skip Blanks | This check box skips the blank addresses within the Modbus map, e.g, the modbus map consists of sequential addresses of 1001, 1002 and 1005, and if 3 addresses are being requested or written to starting from address 1001, modbus server will skip the blanks between 1002 and 1005 and serve the data of 1001, 1002 and 1005. |
With the Serial Port protocol selected, Specify the fields as follows:
| Field | Description |
| Location | This is the name used to identify the Modbus server. |
| Protocol | The Modbus server can be set to run either using Modbus TCP or Modbus Serial. The protocol selected will affect some of the other parameters that appear on this screen. |
| Mode | The mode selects between using Modbus RTU or Modbus ASCII. Acquire™ always uses Modbus TCP for Ethernet connections. |
| Slave ID | This is the slave address that the Modbus server will use. |
| Server Mode | |
| IP Address | This is the IP address that the Modbus server will respond on. The IP address entered must be one of the server`s own allocated IP addresses. Alternatively if there is only one Modbus server on the system you can use the local host address 127.0.0.1 |
| Serial Port | This is the serial port that the Modbus server is connected to |
| Speed | The baud rate at which the Modbus server runs at |
| Data Bits | This is the data bits that the connection will use. The default value is 8. |
| Stop Bits | This is the stop bits that the connection will use. The default value is 1. |
| Parity | This is the parity that the connection will use. The default value is None. |
Once the communication details have been set up, the Modbus map must be created. To add the Modbus map:
- Click the 'Add' button
The Modbus map editor dialog appears.
| Field | Description |
| Address | This is the Modbus address of the field as used by the Modbus server. |
| Field Name | This is the name of the field in the flowcomputer. |
| Field Type | The mode selects between using Modbus RTU or Modbus ASCII. Profile always uses Modbus TCP for Ethernet connections. |
| No. of Bits | Number of Bits for the message format |
| No. of Registers | Number of registers stored for a field |
| Signed | Signed format (default is "unsigned") |
| Reverse Byte Order | Message format is in reverse byte order |
| Reverse Register Order | Message format is in reverse register order |
| Source RTU | Retrieve modbus fields map from the selected RTU |
| Source Field | Modbus fields from the source RTU |
To add the field to the Modbus map:
- Click the 'Save' button
To add the field to the Modbus map and proceed with adding the next:
- Click the 'Save and Next' button
To delete the field from the Modbus map:
- Highlight the appropriate field then click the 'Delete' button
To cancel the field entry and return to Profile:
- Click the 'Cancel' button