PostgreSQL Client

11 min

Overview

To set up and configure this device in Manufacturing Connect Edge, you must:

Step 1: Obtain PostgreSQL Server connection details

Step 2: Set up the PostgreSQL Client Device in Manufacturing Connect Edge DeviceHub

Step 3: Configure a Tag with defined SQL Queries

Step 1: Obtain PostgreSQL Server connection details

To connect to PostgreSQL Server, you require the following connection information . Find these on the PostgreSQL Server or from the appropriate server admin.

Address: IP address/domain for the PostgreSQL server

Port: Port to connect to the PostgreSQL server (default: 5432)

Database: PostgreSQL Database name

Username & Password: Authentication credentials to connect to PostgreSQL server

Step 2: Set up the PostgreSQL Client Device in Manufacturing Connect Edge DeviceHub

Configure the following parameters when you Connect a DeviceConnect a Device with this driver. Update default values to the specific setup of your device.

Parameter	Value
Type	Historian
Driver	PostgreSQL Client
Name	User defined name for the device in Manufacturing Connect Edge
Description	(Optional) Description for device
Address	The network address you found in Step 1
Port	The networkport you found in Step 1 (default: 5432)
Database	Name of database in PostgreSQL
Username	Username of PostgreSQL account
Password	Password of PostgreSQL account
Enable TLS	Select Enable to secure connection via TLS

TLS Configuration

Parameter	Value
CA Chain	Enter or upload the PostgreSQL Server CA Chain in PEM format
Client Auth	Select Enable to enable mTLS
Certificate	When Client Auth is enabled, enter or upload Client Certificate in PEM format
Private Key	When Client Auth is enabled, enter or upload Private Key in PEM format

There are additional advanced configuration options that can be defined for the PostgreSQL device by setting Advanced to Show. These settings are optional.

Parameter	Value
App Name	Client Application ID (optional connection identifier). Default devicehub.
Certificate Verification	Server Certificate and Hostname Verification. Default Enabled.
Request Timeout	Define a request timeout in seconds. Default 10 seconds.
Connection Timeout	Define a connection timeout in seconds. Default 5 seconds.

Step 3: Configure a Tag with defined SQL Queries

When you Add TagsAdd Tags to the connected device, see the following Register Table and Tag Parameters sections.

See the following additional resources if necessary:

Organize Device and Tag Data by Using MetadataOrganize Device and Tag Data by Using Metadata

Tag Formula VariablesTag Formula Variables

Register Table

Name	Value Types	Description
Table - Multi-Row Value	JSON	Results in multiple records in JSON with schema, datatypes and values
Record - Single-Row Value	JSON, BOOL, BYTES, FLOAT32, FLOAT64, INT8, INT16, INT32, INT64, STRING, UINT8, UINT16, UINT32, UINT64	Returns a single record parsed into the DeviceHub standard payload

Tag Parameters

Name: Select a register name from the drop-down list. The available options depend on the names in the register table.

Value Type: Select a data type from the drop-down list. The available options depend on the register name selected.

Polling Interval: Enter a value in seconds. This determines how often the tag should query the PostgreSQL server.

Tag Name: Enter a name for the tag.

Description (Optional): Enter a description for the tag.

Data Query: Enter the desired SQL query.

Only Publish On Change: Select Disabled/Enabled from dropdown.

Parse Timestamp: Select between Column Index, Column Name or None

Timestamp value from a specific column Index or Name will be used as the timestamp value in the DeviceHub payload

Only available when Name is Record - Single-Row Value

Timestamp Index/Name: Define the column index or name from the SQL table

Parse Value: Select between Column Index, Column Name or None

Value from a specific column Index or Name will be used as the value in the DeviceHub payload

Only available when Name is Record - Single-Row Value

Value Type defined above must match the SQL Column datatype

Value Index/Name: Define the column index or name from the SQL table

Tag Formula: Enter a formula for the tag to process the generated data. Two variables are permitted: value (current tag value) and timestamp (current tag UNIX time in milliseconds). The following math functions are available:

sqrt

power: power(x) performs the operation 10^x

log: log(x) is the natural logarithm (the logarithm is in base e)

exp: exp(x) performs the operation e^x

Only Publish on Change of Value: Select the checkbox to customize NATS messages to be published only when the value parameter changes to a new one. Change of Value only applies to boolean, numeric (such as int or float), and simple string data types. It does not apply to complex types, such as JSON or array. Poll-once topics will not be affected by Change of Value settings. These topics will still only see a single message.

Meta Data: Metadata summarizes basic information about data. This feature allows you to define key-value pair data for the device output payload later on. It can then be used to find, use, and reuse particular instances of data.

Note: If you use special characters in meta data key names, the special characters are replaced with underscore characters in the payload. This can cause two key names to be combined into one. For example, configuring the key names a**b and a&&b will cause only one key name to be created (a__b).

Example:

In this example we have the following SQL table in our Microsoft SQL server:

SQL table:

Database: OTdata

Table Name: Metrics

Timestamp	ID	Metric Name	Value	Area	Line	Machine
2025-06-18 08:20:00.000	1	Temperature	56	A1	L1	Temperature sensor
2025-06-18 08:20:00.000	2	Pressure	500	A1	L3	Boiler
2025-06-18 08:20:00.000	3	Power	4000	A1	L4	Laser cutter
2025-06-19 08:20:00.000	4	Temperature	53	A1	L1	Temperature sensor
2025-06-19 08:20:00.000	5	Pressure	550	A1	L3	Boiler
2025-06-19 08:20:00.000	6	Power	4005	A1	L4	Laser cutter
2025-06-20 08:20:00.000	7	Temperature	51	A1	L1	Temperature sensor
2025-06-20 08:20:00.000	8	Pressure	600	A1	L3	Boiler
2025-06-20 08:20:00.000	9	Power	4010	A1	L4	Laser cutter

Tag Configuration 1:

Name: Table - Multi-Row Value

Query: SELECT * FROM [OTdata].[Metrics]

Result:

{
  "success": true,
  "datatype": "JSON",
  "timestamp": 1683901823577,
  "registerId": "DBE0C6D2-A91D-49D1-9CB7-DBF3C6D9C919",
  "value": {
    "Fields":["Timestamp","ID","Metric Name", "Value", "Area", "Line", "Machine" ],
    "Types":["DATE","INT","VARCAR","INT","VARCAR","VARCAR","VARCAR"],
    "Data":[
      ["2025-06-18 08:20:00.000",1,"Temperature", 56, "A1", "L1","Temperature sensor"],
      ["2025-06-18 08:20:00.000",2,"Pressure", 500, "A1", "L1","Boiler"],
      ["2025-06-18 08:20:00.000",3,"Power", 4000, "A1", "L4","Laser cutter"],
      ...
      ["2025-06-18 08:20:00.000",9,"Power", 4010, "A1", "L4","Laser cutter"],
    ]
  },
  "deviceID": "7C01E851-FE46-463A-90EC-98AA3F12BE09",
  "tagName": "table_all",
  "deviceName": "MSSQL_DB",
  "description": "",
  "metadata": {}
}

Tag Configuration 2:

Name: Record - Single-Row Value

Value Type: INT

Query: SELECT * FROM [OTdata].[Metrics]

Parse Timestamp: Column Index

Timestamp Index: 0

Parse Value: Column Name

Value Index: Value

Result:

{
  "success": true,
  "datatype": "JSON",
  "timestamp": 1750407600000,
  "registerId": "DBE0C6D2-A41D-46D1-2CB7-DBF3C6D9C919",
  "value": 4010,
  "deviceID": "7C01E851-FE46-463A-90EC-98AA3F12BE09",
  "tagName": "table_last_entry",
  "deviceName": "MSSQL_DB",
  "description": "",
  "metadata": {}
}