Changing a Label

Changing a Label walks through the smallest useful change to a pallet label: copying the standard Zebra template, altering one thing, telling Commander4j to use it, and checking the result on screen. It takes about half an hour the first time. If you have never seen a label template before, read Label Layouts first.

The walk-through uses a Zebra printer because the free ZPL Renderer lets you see the result without printing anything. The steps are the same for other printer makes except that you cannot preview.

Before you start

• You can log in to Commander4j with a user that has access to Administration › Setup › Modules and Pallet Transactions › Setup › Label Printers.
• You know where Commander4j is installed. The label templates live in the labels folder underneath it; see Folder Structure.
• You have a plain text editor. Notepad on Windows or TextEdit on a Mac is fine. Do not use Word.
• Install ZPL Renderer from the Downloads page on any PC on the same network. The Commander4j PC itself is simplest. It will act as a pretend printer so you can see each change without using label stock.

Step 1. Copy the standard template

In the labels folder find

zebra_300dpi_pallet_label_a5_standard.lbl

and copy it to a new name, for example

zebra_300dpi_pallet_label_mysite.lbl

Always work on a copy. The standard file is replaced when Commander4j is upgraded, and a copy with your own name is left alone.

Step 2. Make one change

Open your copy in the text editor. It is a mixture of three things:

• Lines beginning with /* are comments. They describe the block that follows and are never sent to the printer.
• Zebra commands such as ^FO (position) and ^A0N,100,100 (font and size). Each line draws one thing.
• Placeholders such as <*DESCRIPTION*>, which Commander4j swaps for the real value. The full list is on Label Fields.

Here are three safe changes. Pick one.

Change a caption. Find the line

^FO900,1300^A0N,50,50^CI27^FDBEST BEFORE (MM YYYY)^FS

The text after ^FD is what prints. Change it to USE BY (MM YYYY). Leave everything before ^FD alone.

Change a date format. Find the line

^FO1085,1360^A0N,100,100^CI27^FD<EXPIRYDATE(MM)> <EXPIRYDATE(yyyy)>^FS

and replace the two functions with one: <EXPIRYDATE(dd/MM/yyyy)>. The caption above it should then be changed to match. The letters inside the brackets are explained in Label Function Syntax.

Make text bigger. In ^A0N,100,75 the two numbers are the height and width of the characters in printer dots. Increase both to make the text larger, and remember that wider text needs more room before it runs into the next field.

Save the file as plain text with the .lbl extension.

Do not open the .lbl file in ZPL Renderer directly. The template contains Commander4j directives and placeholders that a renderer does not understand, so the result would be misleading. The way to check a template is to let Commander4j print it, which is what the next two steps set up.

Step 3. Tell Commander4j to use your file

1. Log in to Commander4j and open Administration › Setup › Modules.
2. Set the type filter to Reports and find RPT_PALLET_LABEL. Double-click it, or select it and press Edit.
3. Set Report Type to Label. This tells Commander4j the file is a printer template rather than a standard report. Print Preview is not available for labels.
4. In Report Filename press the ... button and choose your file from the labels folder.
5. Beneath Report Type are the printer settings for the label: Group ID (Pallet), Printer Type (Zebra), Language (ZPL) and DPI (300), with Direct Print on the right. These must match the printer you will choose in the next step, otherwise the printer is not offered on the Pallet Label screen.
6. Press Save.

If several labels are in use at your site, check which label file is used before editing RPT_PALLET_LABEL, because a material type, material or customer may be pointing at a different module.

Step 4. Print to ZPL Renderer and review

This step uses ZPL Renderer as a pretend printer, so you see the label filled in with a real pallet's values without using any label stock.

1. In ZPL Renderer set the DPI to 300 and the label size to match your stock, then press the Network button. It now listens on port 9100, the same port a real Zebra printer uses.
2. In Commander4j open Pallet Transactions › Setup › Label Printers and press Add. Give it an ID such as PREVIEW and choose the Pallet group.
3. Set Printer Type to Zebra, Language to ZPL, DPI to 300, a paper size that matches your stock, the IP address of the PC running ZPL Renderer (127.0.0.1 if it is the same PC) and port 9100. Tick Enabled and Direct Print, then Save.
4. Open the Pallet Label screen, pick a process order, choose PREVIEW in the device drop-down and press Label.

The filled-in label appears in ZPL Renderer. Check the position, font size, spelling and the barcode text. To try another change, edit the .lbl file, save it and press Label again; Commander4j reads the file afresh each time.

If PREVIEW is missing from the drop-down, compare the five settings on the printer with the ones on the module in step 3; they have to agree. See Label Printers.

Note that printing to PREVIEW still creates a pallet record and uses an SSCC number, exactly as a real print would. Use a test process order.

Step 5. Go live

Once you are happy, choose the real printer on the Pallet Label screen instead of PREVIEW. You can leave the PREVIEW printer defined for next time, or untick Enabled so operators do not pick it by mistake.

Keep a copy of your .lbl file somewhere outside the Commander4j folder. It is the only record of your label design.

Going further

• To add a value that is not on the standard label, find its name on Label Fields, copy an existing text line and change the position and placeholder.
• To change what is encoded in a barcode, read the DEFINE BARCODE section of Label Template Syntax first. The GS1 rules are strict and a customer's scanner will reject a barcode that breaks them.
• Zebra ZPL Label explains the standard template block by block.
• The Zebra ZPL Programming Guide describes every command.