Question about Monarch 9855 Thermal Printer

1 Answer

Invalid Command Hello, I am trying to connect a label software application, "label Matrix 5.0" to a Monarch (Paxar) 9855 Thermal printer and i keep getting the error "Invalid Command Line 01 Code 287"? The printer is set up on a AS400 from Manhattan version 2004r2. I retrieved the IP address from the system and set it up using the Printer set up. The only thing i can think of the problem being is that when i do set up the printer using the IP address, there is no Paxar 9855 driver the closest i could find was a 9830-CL. Either way the message is getting sent to the printer or i would not be receiving the Invalid Command error. If you could assist on this issue i would appreciate it.Thanks in advance,Jason

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert who has written 50 answers of more than 400 characters.


    An expert whose answer gotĀ voted for 20 times.

  • Expert
  • 113 Answers
Re: Invalid Command

Your 287 error has to do with an incorrect setting for printhead width, and in the control language that your software is sending to the printer, they either have something other than 0, or there is an invalid character like a carriage return or line feed being sent to the printer.

This is a difficult one to trace since the software sends the code and you cannot necessarily change what is being sent.

Please note that the software that you really should be using is PC Mate Plus, as this is a specialized printer for Paxar supplies called Care Labels. You may be able to cheat if your software allows you to select 300DPI print heads. If not, you'll need the software I suggest.

If you do not have this software, please contact Paxar (now Avery Dennison) at 1-800-543-6650 and ask to be connected to someone in technical support or if the customer service rep can offer you a link to a website for software download, or purchase.


Posted on Feb 06, 2008

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer


Errors 001 to 405 and 429 to 435 are data errors. This type of error indicates that incorrect data was sent to the printer, and the printer is ignoring it. Your System Administrator should correct the packet and send it back to the printer. Error 411 is baud rate mismatch. Here's the manual:

Jun 17, 2014 | Monarch Paxar? 9855 Label Printer

2 Answers

Invalid command, line 01 code 400

Mornach 9825 printer is error "Invalid Command! Line 01 Code 400 ".How issue this error.

Apr 16, 2011 | Monarch Paxar 9855 Printer

1 Answer

How do you change the printer head

Here is the link to the 9855 operator's manual. Page 101 of 132 shows you how to replace the printhead. It's a pretty simple procedure.

Dec 13, 2010 | Paxar Monarch 9825 Thermal Label Printer

2 Answers

Where can I buy Paxar Monarch 9855, 9835, 9800 printer spares from

To buy a Paxar Monarch 9855 you can buy it to the nearest appliance center or any electronic center in your place. If you can not see that in your place you can buy it through online. Visit and inquire it in ebay or amazon website. or

Thanks and good luck!


Dec 23, 2009 | Paxar Monarch 9855 Thermal Printer

1 Answer

We have a 9855 Monarch barcode Printer. We are

If the printer display just shows Ready, but doesn't print, there could be a few things wrong.

1 - no data is going to the printer
2 - data is going to the printer, but it is not the printer's native language
3 - cable connectivity issues
4 - wrong cable is being used
5 - if wireless, data is not going to the correct IP

If using a 3rd party application, make sure that you've chosen the correct Monarch printer, as well as printing to the correct port. Sometime people print to LPT instead of Serial, as an example.

If using 3rd party drivers, make sure of the same thing.

To see if the printer actually works, press both of the arrows on the display, at the same time, after the printer is at the ready screen. As long as have the printer configured correctly (ribbon, supply type, etc.), the printer should print out a couple of labels.

Oct 26, 2009 | Paxar Monarch 9855 Barcode Label Printers...

3 Answers

Monarch Paxar 9855 Printing Errors

can you try a serial connection, what type of operating system are you using?

Aug 07, 2009 | Monarch 9855 Thermal Printer

1 Answer

Paxar 9855 print error

You have a format problem. Something isn't correct in your mpcl code.
Error 400 - "The character immediately following { is invalid or not an ASCII character."

Jun 01, 2009 | Monarch 9855 Thermal Printer

1 Answer

9855 ribbon take up reel not working

When you're sending data to the printer you're sending a command that is telling the printer you're NOT using a ribbon. When the printer receives the data it's shutting off the ribbon. Check your software.
You should be set for THERMAL TRANSFER.(RIBBON)

Feb 04, 2009 | Paxar Monarch 9855 Thermal Printer

2 Answers

Paxar 9855

If you have not found an answer to your issue, you may wish to call their tech support at

Labels are supposed to come off the liner, but if you have the supplies or ribbon loaded incorrectly, or if you have adhesive coming in contact with the ribbon before the media indexes to the next label, I can see where the ribbon can get attached to the labels.

You shouldn't have any slack in your ribbon when the printer prints, and if you do, you may need to make minor adjustments to take up that slack.

As for a heating adjustment, I'm not sure what you mean, but there is an adjustment to increase the printhead temperature, but that is only to increase the contrast on your labels, and should have zero effect on your reported issue.

Contact's tech support line if you find that the data in this response isn't able to guide you to the culprit.

Feb 13, 2008 | Paxar Monarch 9855 Thermal Printer

Not finding what you are looking for?
Monarch 9855 Thermal Printer Logo

336 people viewed this question

Ask a Question

Usually answered in minutes!

Top Monarch Printers & Copiers Experts

David Payne
David Payne

Level 3 Expert

13437 Answers


Level 3 Expert

3932 Answers

ray gallant

Level 3 Expert

34649 Answers

Are you a Monarch Printer and Copier Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides