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Connect a printer

Printer installation can be done in a few easy steps. The printer can be used to print receipts, labels, orders, or even reports from the different Odoo apps. In addition, printer actions can be assigned as an action on a trigger during the manufacturing process, or added onto a quality control point or a quality check.

:::{warning} The only way to connect a printer directly to an Odoo database is through the use of an IoT system. Without an IoT system, printing can still occur, but it is managed through the printer itself, which is not the recommended process. :::

Connection

IoT systems support printers connected through USB, network connection, or Bluetooth. Supported printers are detected automatically, and appear in the {guilabel}Devices list of the IoT app.

:alt: The printer as it would appear in the IoT app devices list.

:::{note} Printers can take up to two minutes to appear in the IoT app {guilabel}Devices list. :::

Link a printer

Link work orders to a printer

Work orders can be linked to printers, via a quality control point, to print labels for manufactured products.

In the {doc}Quality app </applications/inventory_and_mrp/quality>, a device can be set up on a quality control point. To do so, go to the {menuselection}Quality --> Quality Control --> Control Points, and open the desired control point.

:::{important} A manufacturing operation and work order operation need to be attached to a quality control point before the {guilabel}Type field allows for the {guilabel}Print Label option to be selected. :::

From here, edit the control point by selecting the {guilabel}Type field, and selecting {guilabel}Print Label from the dropdown menu of options. Doing so reveals the {guilabel}Device field, where the attached device can be selected.

The printer can now be used with the selected quality control point. When the quality control point is reached during the manufacturing process, the database presents the option to print labels for a specific product.

:::{tip} Quality control points can also be accessed by navigating to {menuselection}IoT --> Devices, then selecting the device. Go to the {guilabel}Quality Control Points tab to add them to the device. :::

:::{note} On a {doc}quality check form </applications/inventory_and_mrp/quality/quality_management/quality_checks>, the {guilabel}Type of check can also be set to {guilabel}Print Label. :::

:::{seealso}

{doc}/applications/inventory_and_mrp/quality/quality_management/quality_control_points
{doc}/applications/inventory_and_mrp/quality/quality_management/quality_alerts :::

(iot-link-printer)=

Link reports to a printer

It is possible to link report types to a specific printer. To do so:

Go to {menuselection}IoT --> Devices and select the desired printer.
Go to the {guilabel}Printer Reports tab and click {guilabel}Add a line.
In the pop-up that opens, select the types of reports to be linked to the printer and click {guilabel}Select.

:alt: The list of reports assigned to a printer in the IoT app.

:::{tip} Reports can also be configured by {ref}enabling the developer mode <developer-mode> and going to {menuselection}Settings --> Technical --> Reports. Select the desired report from the list and set an {guilabel}IoT Device. :::

The first time a linked report is selected to print, a {guilabel}Select Printers pop-up window appears. Tick the checkbox next to the correct printer for the report, and click {guilabel}Print. At that point, the report is linked to the printer.

Clear device printer cache

After a printer is linked to print a report, the setting is saved in a browser's cache. This means a user can have different devices saved in their cache for different reports, based on the device they use to access Odoo. It also means different users can have a report automatically printed from different printers, based on their preferences.

To unlink a report from a printer, navigate to {menuselection}IoT --> Configuration --> Reset Linked Printers. This generates a list of reports that are linked to a printer on the current device. Click the {guilabel}Unlink button next to each report to remove the link.

:::{important} This step only prevents the report from automatically printing to the listed printer from the current browser. The report is still {ref}linked <iot/link-printer> on the device, under the {guilabel}Printer Reports tab. :::

:alt: A list of reports currently linked to a printer in the IoT app.

:::{seealso} {doc}POS Order Printing <../../../sales/point_of_sale/restaurant/kitchen_printing> :::

Potential issues

The printer is not detected

If a printer does not appear in the devices list, go to the {ref}IoT box's <iot/iot-box/homepage> or {ref}Windows virtual IoT's <iot/windows-iot/homepage> homepage, click {guilabel}Show in the {guilabel}Devices section, and make sure the printer is listed.

If the printer does not appear on the IoT system's homepage, click {guilabel}Printer Server, then {guilabel}Administration, and {guilabel}Add Printer. If the printer is not in the list, it is likely not connected properly.

The printer outputs random text

For most printers, the correct driver should be automatically detected and selected. However, in some cases, the automatic detection mechanism might not be enough, and if no driver is found, the printer might print random characters.

The solution is to manually select the corresponding driver. On the IoT system's homepage, click {guilabel}Printer Server, then {guilabel}Printers, and select the printer in the list. In the {guilabel}Administration dropdown menu, click {guilabel}Modify Printer. Follow the steps and select the printer's make and model.

:alt: Edit the printer connected to the IoT system.
:scale: 75%

:::{note} Epson receipt printers and Zebra label printers do not need a driver to work. Make sure that no driver is selected for those printers. :::

The printer is detected but is not recognized correctly

If Odoo and the IoT system do not recognize the printer correctly, go to {menuselection}IoT --> Devices, click the device's card to access its form, and set the {guilabel}Subtype field to the appropriate option: {guilabel}Receipt Printer, {guilabel}Label Printer, or {guilabel}Office Printer.

Epson configuration special case

Most Epson printers support printing receipts in Odoo Point of Sale using the GS v 0 command. However, the following Epson printer models do not support this command:

TM-U220
TM-U230
TM-P60
TMP-P60II

To bypass this issue, you can configure the printer to use the ESC * command.

First, review Epson's website for compatibility for both the GS v 0 and ESC * commands.

If the printer is incompatible with GS v 0 but supports ESC *, configure the IoT system to use the ESC * command as follows:

Access the {ref}IoT box's <iot/iot-box/homepage> or {ref}Windows virtual IoT's <iot/windows-iot/homepage> homepage.
Click the {guilabel}Printer server button, then click {guilabel}Administration on the CUPS page.
Click {guilabel}Add Printer in the {guilabel}Printers section, select the printer, and click {guilabel}Continue.

:::{tip} If the printer's name is still uncertain, take the following steps:
1. Take note of the listed printers on the CUPS page.
2. Turn the printer off and refresh the page.
3. Compare the difference with the first list to see which printer disappeared.
4. Turn the printer back on and refresh the page again.
5. Double-check the list again to see if the printer re-appears.
6. The printer that disappeared and reappears again on the listed printers is the name of the printer in question. It can be {guilabel}Unknown under {guilabel}Local printers. :::
On the {guilabel}Add Printer page, specify the printer's {guilabel}Name using the following convention: <printer_name>__IMC_<param_1>_<param_2>_..._<param_n>__, where:
- printer_name is the printer's name. It can contain any character except _, /, #, or ` ` (space character).
- IMC: This stands for Image Mode Column (the simplified name for ESC *).
- param_1: This stands for the specific parameter:
  - SCALE<X>: Scale of the picture (with the same aspect ratio). X should be an integer describing the scale percentage that should be used. For example, 100 is the original size, 50 is half the size, and 200 is twice the size.
  - LDV: Low Density Vertical (will be set to High Density Vertical if not specified).
  - LDH: Low Density Horizontal (will be set to High Density Horizontal if not specified).
  :::{note}
  - Density parameters might need to be configured in a particular way, depending on the printer model.
  - Refer to Epson's ESC * documentation to determine if the printer requires these parameters to be set. :::
```
.. example::
   The following are examples of proper and improper name formatting:

   Proper name formatting:

   - `EPSONTMm30II__IMC__`
   - `EPSON_TM_U220__IMC_LDV_LDH_SCALE80__`

   Improper name formatting (this will not prevent printing, but the result might not have the
   expected printed output):

   - `EPSON TMm 30II`: The name cannot contain spaces.
   - `EPSONTMm30II`: The name itself is correct, but it will not use `ESC *`.
   - `EPSONTMm30II__IMC`: This name is missing the end `__`.
   - `EPSONTMm30II__IMC_XDV__`: The parameter `XDV` does not match any existing parameters.
   - `EPSONTMm30II__IMC_SCALE__`: The parameter `SCALE` is missing the scale value.
```
Once the printer's name has been defined using the appropriate naming convention, click {guilabel}Continue.
Set the {guilabel}Make value to {guilabel}Raw and the {guilabel}Model value to {guilabel}Raw Queue (en).
Click {guilabel}Add Printer. If everything was done correctly, the page should redirect to the {guilabel}Banners page.
Wait a few minutes for the IoT system to detect the printer and sync to Odoo's server.
{ref}Access the POS settings <configuration/settings> and select your POS, or click the vertical ellipsis button ({guilabel}⋮) on a POS card and click {guilabel}Edit. Scroll down to the {guilabel}Connected Devices section, enable {guilabel}IoT Box, and select the printer in the {guilabel}Receipt Printer field. Click {guilabel}Save.

:::{note} If the printer was set up incorrectly (e.g., it continues to print random text, or the printed receipt is too large or too small), it cannot be modified via the printer's name in CUPS. Instead, configure a new printer from scratch with modified parameters, following the steps above. :::

.. spoiler::
   Example

   The following is an example of the troubleshooting process for a TM-U220B printer model using the
   `ESC *` command. The receipt pictured below is an example of a receipt that is printing correctly
   due to proper formatting (in theory):

   .. image:: printer/receipt-example.png
      :scale: 60%
      :alt: Properly formatted receipt picture from a demo database.

   Printing this receipt immediately without proper formatting will not work, as the TM-U220B
   printer model does not support the `GS v 0` command. Instead, random characters will be printed:

   .. image:: printer/receipt-print-random-letters.png
      :scale: 60%
      :alt: Printer paper with seemingly random characters.

   To properly configure formatting for the Epson TM-U220B printer model, follow these steps:

   #. After checking Epson's website for compatibility with both the `GS v 0
      <https://download4.epson.biz/sec_pubs/pos/reference_en/escpos/gs_lv_0.html>`_ and `ESC *
      <https://download4.epson.biz/sec_pubs/pos/reference_en/escpos/esc_asterisk.html>`_ commands,
      the TM-U220B printer is indeed incompatible with `GS v 0` but supports `ESC *`.

      .. image:: printer/epson-compatibility-compare.png
         :alt: Epson compatibility evaluation from Epson website.

   #. When adding the printer, CUPS displays the list of available printers:

      .. image:: printer/add-printer.png
         :scale: 75%
         :alt: Administration menu, add printer selection.

      In this case, the printer is connected via USB, so it is not part of the
      :guilabel:`Discovered Network Printers`. Instead, it is likely part of the :guilabel:`Unknown`
      selection under :guilabel:`Local Printers`. By unplugging the printer's USB cable from the IoT
      system and refreshing the page, the :guilabel:`Unknown` printer disappears. By plugging it
      back in, the printer reappears.

   #. For the naming convention, since the printer must print using the `ESC *` command, it is
      imperative to add `__IMC`.

      .. image:: printer/epson-tm-u220-specification.png
         :alt: Epson TM-U220 specifications on manufacturer's website.

      For this particular model (TM-U220) `m` should be equal to 0 or 1. While referencing the
      :guilabel:`Description` table on `Epson's ESC * website
      <https://download4.epson.biz/sec_pubs/pos/reference_en/escpos/esc_asterisk.html>`_, the `m`
      values could be 0, 1, 32, or 33. So, in this case, the `m` value **cannot** be 32 or 33
      (otherwise, random characters will be printed).

      The table includes the numeric values 32 and 33; they both occur if the :guilabel:`Number of
      bits for vertical data` is set to 24, i.e. it has a *High Vertical Density*. In the case of
      configuring the Epson TM-U220, the *Low Vertical Density* will need to be forced, as
      this printer model does not support *High Vertical Density* for this command `ESC *`.

      To add a *Low Vertical Density*, add the `LDV` parameter to the naming convention.

      .. image:: printer/add-printer-filled.png
         :alt: Add a *Low Vertical Density* (the `LDV` parameter) to the naming convention.

   #. Click :guilabel:`Continue` to proceed. Next, set the :guilabel:`Make` value to :guilabel:`Raw`
      and the :guilabel:`Model` value to :guilabel:`Raw Queue (en)`.

      .. image:: printer/add-printer-add.png
         :alt: Epson TM-U220 specifications on manufacturers website.

      However, when trying to print with the naming convention `EpsonTMU220B__IMC_LDV__`, the
      receipt is printed, but it is too large and outside the margin. To resolve this, add a new
      printer (and naming convention) with the `SCALE<X>` parameter to adapt to the receipt's size.

      Here are some examples:

      .. list-table::
         :header-rows: 1

         * - Printer Naming Convention
           - `EpsonTMU220B__IMC_LDV__`
           - `EpsonTMU220B__IMC_LDV_SCALE75__`
           - `EpsonTMU220B__IMC_LDV_LDH__`
           - `EpsonTMU220B__IMC_LDV_LDH_SCALE35__`
         * - .. image:: printer/receipt-example.png
                :alt: Receipt example format.
           - .. image:: printer/tm-u220-ldv.png
                :alt: Receipt format using naming convention: EpsonTMU220B__IMC_LDV__.
           - .. image:: printer/tm-u220-ldv-scale75.png
                :alt: Receipt format using naming convention: EpsonTMU220B__IMC_LDV_SCALE75__.
           - .. image:: printer/tm-u220-ldv-hdv.png
                :alt: Receipt format using naming convention: EpsonTMU220B__IMC_LDV_LDH__.
           - .. image:: printer/tm-u220-ldv-hdv-scale35.png
                :alt: Receipt format using naming convention: EpsonTMU220B__IMC_LDV_LDH_SCALE35__.

DYMO LabelWriter print issue

The DYMO LabelWriter has a known issue in printing with IoT systems. The OpenPrinting CUPS server installs the printer using {guilabel}Local RAW Printer drivers. In order to print anything, the correct {guilabel}Make and Model needs to be set to reference the correct driver when using the device.

Additionally, a new printer needs to be added to reduce the print delay that occurs after updating the driver.

:::{important} The DYMO LabelWriter 450 DUO printer is the recommended DYMO printer for use with Odoo and IoT systems. This device combines two printers: a label printer and a tape printer. When configuring the following processes, it is essential to select the correct model (either DYMO LabelWriter 450 DUO Label (en) or DYMO LabelWriter 450 DUO Tape (en)). For consistency, the following processes outline configuration steps for the DYMO LabelWriter 450 DUO Label (en) model. Adjust the model selections as needed. :::

(printer-dymo-update-drivers)=

DYMO LabelWriter not printing

If the DYMO LabelWriter fails to print, install a new driver:

Access the IoT system's homepage and click {menuselection}Printer server to open the OpenPrinting CUPS console.
Click {menuselection}Printers in the top menu, then click the printer in the list.
Select {guilabel}Maintenance in the first dropdown menu.

Select {guilabel}Modify Printer in the second dropdown menu.

:alt: |-
:  Modify the make and model of the DYMO LabelWriter. Maintenance and Modify dropdown
:  menus highlighted.

Select the specific network connection/printer on which the modification should be made and click {guilabel}Continue.
On the next page, click {guilabel}Continue, then select {guilabel}DYMO from the {guilabel}Make dropdown list.
Click on {guilabel}Continue and set the {guilabel}Model to {guilabel}DYMO LabelWriter 450 DUO Label (en) (or whichever DYMO printer model is being used).
Click {guilabel}Modify Printer to set the new driver; a confirmation page appears.
Click {menuselection}Printers in the top menu; all printers installed on the OpenPrinting CUPS server appear, including the newly updated {guilabel}DYMO LabelWriter 450 DUO Label (or whichever DYMO printer model is being used).
Click the newly updated printer, then click the {guilabel}Maintenance dropdown menu and select {guilabel}Print Test Page to print a test label. The test label is printed after a few seconds if the driver update was successful.

To reduce this delay, add a new printer using the steps below.

DYMO LabelWriter print delay

:::{tip} If the DYMO LabelWriter 450 DUO printer is not printing at all, or is not recognized (i.e., it has a {guilabel}RAW driver type), then {ref}update the drivers on the device <printer/dymo/update_drivers>. :::

To resolve the delay issue after modifying the driver, reinstall the printer:

Access the IoT system's homepage and click {menuselection}Printer server to open the OpenPrinting CUPS console.
Click {menuselection}Administration in the top menu, then click {guilabel}Add a Printer.
On the next page, in the {guilabel}Local Printers section, select {guilabel}DYMO LabelWriter 450 DUO Label (DYMO LabelWriter 450 DUO Label) (or whichever DYMO printer model is being used) pre-installed printer. Click {guilabel}Continue.
```
:alt: |-
:  Add a printer screen on OpenPrinting CUPS with DYMO LabelWriter 450 DUO Label
:  highlighted.
```
On the following screen, update the {guilabel}Name to something easily identifiable, as the original printer will remain in the list. Then, click {guilabel}Continue.
```
:alt: Rename printer page in the 'Add a Printer' flow, with the name field highlighted.
```
Set the {guilabel}Model field to {guilabel}DYMO LabelWriter 450 DUO Label (en) (or whichever DYMO printer model is being used), then click {guilabel}Add Printer to complete the installation.
```
:alt: |-
:  Choose model screen on the OpenPrinting CUPS console with model and add a printer
:  highlighted.
```
Click {menuselection}Printers in the top menu and click the newly installed printer {guilabel}DYMO LabelWriter 450 DUO Label (or whichever DYMO printer model is being used) from in the list.
```
:alt: Printer page with newly installed printer highlighted.
```
Click the {guilabel}Maintenance dropdown list and select {guilabel}Print Test Page to print a test label. The test label should print out immediately, or after one or two seconds.

The Zebra printer does not print anything

Zebra printers are quite sensitive to the format of the printed Zebra Programming Language (ZPL) code. If nothing comes out of the printer or blank labels are printed, try changing the format of the report sent to the printer. To do so, activate the {ref}developer mode <developer-mode>, go to {menuselection}Settings --> Technical --> User Interface --> Views, and search for the corresponding template.

:::{seealso} Zebra's instructions on printing ZPL files :::

Barcode scanner issues

The characters read by the barcode scanner do not match the barcode

By default, most barcode scanners are configured in the US QWERTY format. If the barcode scanner uses a different layout, go to {menuselection}IoT --> Devices and click the barcode device's card. Then, select the correct language in the {guilabel}Keyboard Layout field.

:::{note} The {guilabel}Keyboard Layout is language-specific, with available options varying based on the device and the language of the database (e.g., {guilabel}English (UK), {guilabel}English (US), etc.). :::

Nothing happens when a barcode is scanned

Make sure the correct device is selected in the {doc}Point of Sale settings </applications/sales/point_of_sale/configuration/pos_iot> (when applicable) and the barcode is configured to send an ENTER character (keycode 28) at the end of every barcode.

The barcode scanner is detected as a keyboard

:::{important} Some barcode scanners are identified as USB keyboards rather than barcode scanners and are not recognized by IoT systems. :::

To change the device type manually, go to {menuselection}IoT --> Devices and click the barcode device's card. Then, enable {guilabel}Is scanner.

The barcode scanner processes barcode characters individually

When accessing the mobile version of Odoo from a mobile device or tablet paired with a barcode scanner via the IoT system, the scanner might interpret each character in a barcode as a separate scan. To resolve this, go to {menuselection}IoT --> Devices and click the barcode device's card. Then, select the correct language in the {guilabel}Keyboard Layout field.

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