Applied Parameters: UpdateCaption=False Summary
This command is used to place a String object onto the active document.
A string is a primitive design object. It places text on the selected layer in a variety of display styles and formats, including popular barcoding standards. As well as user-defined text, a special type of string referred to as a special string, can be used to display board or system information, or the value of user-parameters on the board .
In addition, true multi-line text support simplifies the task of adding substantial sections of text into PCB layouts, such as that often included to provide technical, mechanical, and assembly notes on board mechanical layers.
This command can be accessed from the PCB Editor and the PCB Library Editor by:
Place » String command from the main menus. Locating and using the
String command ( ) on the Active Bar. Clicking the
button on the Wiring toolbar (PCB Editor) and the PCB Lib Placement toolbar (PCB Library Editor). Right-clicking in the workspace then choosing the
Place » String command from the context menu. Use
After launching the command, the cursor will change to a cross-hair and you will enter string placement mode. A string will appear "floating" on the cursor:
Position the cursor then click or press
Enter to place a string. Continue placing further strings or right-click or press
Esc to exit placement mode.
Additional actions that can be performed during placement are:
Spacebar to rotate the string counterclockwise or Shift+Spacebar for clockwise rotation. Rotation is in accordance with the value for the Rotation Step defined on the PCB Editor – General page of the Preferences dialog. Press the
X or Y keys to mirror the string along the X-axis or Y-axis respectively. Press the
L key to flip the string to the other side of the board. Press the + and - keys (on the numeric keypad) to cycle forward and backward through all visible layers in the design respectively, to change placement layer quickly.
The default text for a newly-placed string object is
String. Once placed (unless changed before or during placement), change this text as required using the text entry window when viewing the properties for the string through the Properties panel. Keep in mind that text will not be automatically wrapped, so all text entered on the same line will appear on that single line only. To add a new line, use the Shift+Enter keyboard shortcut while in the text entry window. While string objects can be used to place user-defined text on the current PCB layer, it is not
just user-defined text that can be placed. To assist in producing documentation, the concept of "special strings" is used. These act as placeholders for design, system or user information that is to be displayed on the PCB at the time of output generation:
A special string is denoted by the string starting with a . (dot) character (e.g.
.Net_Count, etc). If a string starts with ".", the entire string is treated as a 'special' string. This syntax is also used when referencing a user-parameter, the parameter name is preceeded by the "." (dot) character.
There is a default set of predefined special strings provided for use with new PCB documents. You can also add your own custom special strings by defining additional parameters at the project-level; these parameters are defined in the
Parameters Tab of the Options for Project dialog. To include more than one string in a 'special' string, use apostrophe ( ' ) to enclose each string. Example:
'.PcbDoc' '.PcbName'. Spaces and/or special characters can also be used inside 'special' strings. Example:
'.PcbDoc #1'. To use a special string on a PCB, place a string object and access the properties for the string through the
Properties panel. Clear the text entry window, then click the button - a list of special strings you can use will pop-up. The values of some special strings can only be viewed when the relevant output is generated. Most special strings can be viewed directly on-screen however.
Three Stroke-based fonts are available –
Default, Sans Serif and Serif. The Default style is a simple vector font which supports pen plotting and vector photoplotting. The Sans Serif and Serif fonts are more complex and will slow down vector output generation, such as Gerber. When using TrueType fonts, TrueType and OpenType (a superset of TrueType) fonts found in the
\Windows\Fonts folder will be available for use. The feature also offers full Unicode support. Note that only detected (and uniquely named) root fonts will be available for use. For example,
Arial and Arial Black would be available but Arial Bold, Arial Bold Italic would not. The ability to place barcode symbols directly onto a PCB on any layer is provided allowing barcodes to be easily imprinted on a PCB as part of the manufacturing process. To use a Barcode font, set the
Font Type (in the Properties panel) to BarCode, and define the display options as required. BarCode ISO Code 39 (US Dept of Defense standard) and Code 128 (global trade identification standard) are supported and the actual text string that the barcode is derived from can also be displayed.