Messages | Terminator

Message and Terminator

This section provides terminology and details concerning communication between the power supply controller and devices.

The program messages and response messages supported by a device are called "device messages."



The availability of a message depends on the type of control board mounted and DC power-supply unit connected.


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The messages transmitted from the controller to a device are called “program messages.” The messages transmitted from a device to the controller are called “response messages.”

Each message is composed of a program header and data.

Program messages

There are two types of program messages: command messages and query messages.

A command message is used to execute a specified function of a device and to alter settings. A query message is used to inquire about the settings and status of a device.

Writing program messages

Provide a space (ASCII: 20h) between the program header and the data.


When there is more than one piece of data, connect them using “, ” (ASCII: 2Ch).


To connect one program message to another, use “;” (ASCII: 3Bh).


To describe data using hexadecimal numbers, add “#H.”

Example: To describe the decimal number “10” using a hexadecimal number, write “#H0A.”

When “@” is added to the end of a program message, the hold-off status is retained until execution of the message is completed. However, in the event of a program message terminator with only EOI, use “@@”.

 Acknowledgement messages (RS232C)

The acknowledgement message is peculiar to the RS232C interface. This message is sent from the power-supply controller to a terminal. It indicates that a program message has been processed.


An acknowledgement message is a character string of ASCII code which is composed only of a header. There are two types such messages:

OK: Normally terminated

ERROR: Abnormality occurring, such as a syntax error

Through the use of a SILENT command message, it can be specified whether to return an acknowledgement message.


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The terminator used to indicate that a program message has been terminated is called a “program message terminator.” The terminator used to indicate that a response message has been terminated is called a “response message terminator.”

Program message terminators

One of the following may be used. No preliminary settings are required.





Response message terminators

CR+LF+EOI is set by default. Using either a TRM or DELIMITER command message, it can be changed to one of the following: