Oemax Serial

6 min

Review the following information for setting up and configuring the Oemax Serial driver.

Litmus Edge Compatible Series

Compatibility parameter	Compatible items
Driver type	Serial
Validated devices/series	RS Automation Oemax Series

To set up and configure this device in Litmus Edge, you will need to do the following:

Step 1: Set up and Configure the PLC Device

Step 2: Set up the PLC Device in Litmus Edge DeviceHub

Step 3: Configure the List of Registers

Step 1: Set up and Configure the PLC Device

Record the serial communication parameters for the device. Otherwise, follow the steps below.

To configure your device:

Record the following information and refer to it when needed.

Device: RS Automation Oemax NX7

Communication I/F: RS232. Refer to the following figure.

Reference image of device

Launch the WinGPC software and find the network parameters. If needed, refer to the following wiring and switch settings.

Wiring and Switch Settings

Step 2: Set up the PLC Device in Litmus Edge DeviceHub

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

Parameter	Value
Type	RS Automation
Driver	Oemax Serial
Communication Port	Local Serial connection file path
Baud Rate	9600
Data Bits	8
Parity	Even, Odd, None
Stop Bits	1
Station ID	255

Step 3: Configure the List of Registers

When you Add a Tag to the connected device, refer to the following register table and tag parameters.

See the following additional resources if necessary:

Organize Device and Tag Data by Using Metadata

Tag Formula Variables

Register Table

Name	Value Types	Address Format	Max Address	Description
R	bit	DDDdd	25515
L	bit	DDDdd	2047
M	bit	DDDDdd	199915
K	bit	DDDdd	25515	Keep Contact
F	bit	DDDdd	99115	Special Contact
TC	bit	DDD	255	Timer/Counter
W	word	DDDD	7999	Special Auxiliary Relay
SV	word	DDD	255	Timer/Counter Set Value
PV	word	DDD	255	Timer/Counter Preset Value
SR	word	DDD	255	Special Register
WR	word	DDD	255
WL	word	DDD	255
WM	word	DDDD	1999
WK	word	DDD	255
WF	word	DDD	991	Timer Memory

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 poll the register for data.

Tag Name: Enter a name for the tag.

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

Address: Enter a tag address. The value must in the decimal format, within the allowed min/max range. Omit the leading zeros. The device might use the decimal (D), hexadecimal (H), or octal (O) address format. See the Register Table at the bottom of the dialog box. For Bit tags, append the bit address without the bit separator. The lowercase letters in the address format indicate how many digits you should enter in the Bit address.

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 only publish NATS messages when the value parameter changes to a new value. 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. Metadata 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).