Custom Protocol Out (CPO) Instruction

Ladder Input

Must Have

Edge-driven. With every transition of Input from OFF to ON the instruction will execute.

Drop Down Selection

Must Have

The Serial Port from where ASCII data is sent.

Constant

Must Have

The Data Length to be sent, specified in 1 to 4Bytes based on Data Type. Note: Maximum 128 bytes allowed for data.

Numerical Tag or Constant

Must Have

Embedded Data sent out to the Serial Port from a specified Tag or Constant.

Checkbox Option

Optional

Every Two Characters will be Swapped when Data is sent.

Optional

Select if Checksum calculation is to be performed on Data Sent.

Drop-Down Selection

Must Have if Checksum is selected

Type of CRC (Cyclic Redundancy Check) or XOR calculation to perform on the Data to be Sent.  This needs to match the calculation method of the Receiving device.  Enabled when Checksum option is selected.

Constant

Determines where to place the Checksum result.

Selectable Option

Determines whether the CPU sets the CRC or XOR value as High Byte first or Low Byte first.  Enabled when Checksum option is selected.

Selectable Option

Determines which Bytes of the Data to be Sent should be used in the Checksum Calculation.  Enabled when Checksum option is selected.

Checkbox Option

Optional when Checksum is selected

Different Checksum calculations use different preloads for the calculation.  Check the receiving device technical documentation to determine this value.  Enabled when Checksum option is selected.

Selectable Option

Must have No Termination, 1 Character or 2 Characters selected.

CPU will be sending a Fixed number of characters.  This requires no check for a termination character.

Selectable Option

This option specifies that the CPU will send out 1 Character that is specified in the Termination Code 1 0x field trailing the String field data.

Selectable Option

This option specifies that the CPU will send out 2 Characters that are specified in the Termination Code 1 0x field and Termination Code 2 0x field trailing the String field data.

Boolean Tag

Optional

This bit turns ON when the Ladder Logic attempts to send the Data out of the Serial Port.  This bit turns OFF once the data has been sent.

Boolean Tag

Optional

This bit turns ON once the Data has been successfully sent out the Serial Port

Checkbox

Optional

Enables the use of Structures.

Select a Serial Port

Enter a Value Tag for Data Length.  1 to 4 Bytes.

Select a Tag to place Data into.

Select if Input to be Byte Swapped.

Select for Checksum Calculation.

Select Checksum Type.

Enter a value for Checksum Result Offset.

Select High-Low or Low-High Order.

Select All Ranges or enter a Byte Range.

Select based on Communicating device documentation.

Select to leave with No termination.

Select for 1Termination Character.

Select for 2 Termination Characters.

Enter a Hexadecimal value.

Enter a Hexadecimal value.

Select a Boolean Tag for the In Progress bit status.

Select a Boolean Tag for the Complete bit status.

Enables the use of Structures.