How to send this command to RS232 Port

[青风细雨楼]

I want to use LV to control a label printer to print what I need. Following info is from printer user manual.

From RS232 port:

If Codex has been used with the controller then the simple serial protocol will need to be enabled by sending ESC Z SWITCH ON <CR> (without spaces). Codex automatically disables the simple protocol for security reasons, so it is a good idea to start all sessions with this command.

ESC Z S W I T C H O N <CR>

à From BASIC the first line would be CHR$(27)+”ZSWITCHON”+CHR$(13)

Send the following ASCII data to the RS232 port:

ESC J 0 C H R I S T M A S <CR>

ESC J 1 A N D   S E A S O N S <CR>

ESC J 2 G R E E T I N G S <CR>

ESC J 3 T O   M Y   H E L P E R S <CR>

ESC J 4 0 9 8 7 6 5 4 3 2 1 2 1 <CR>

à From BASIC the first line would be CHR$(27)+”J0CHRISTMAS”+CHR$(13). Etc.

In VB I can use this command to control the printer. But In LV how can I do?

I'd appreciate it if anybody give me a simple sample.

[Dennis_Knutson]

A string control or constant in LabVIEW can be set for normal, hex, or '\' code display by just right clicking on the control constant. CHR$(27) is the the ESC character and the hex equivalent of 27 is 1B. The CR is hex  0D. So, a simple way to do this would be to have a hex display constants for the ESC and CR character and a normal display for the the command. Use the concantanate string function to build one string.

Message Edited by Dennis Knutson on 10-10-2007 09:57 PM

[青风细雨楼]

Hi Dennis,

Thanks for your help, I will try it.

[青风细雨楼]

Hi Dennis,

I tried it according to your suggestion, but when I change to HEX display the text controler display "010B" not "1B", "000D" not "0D".

Can you send me your Vi file?

Thanks.

[Dennis_Knutson]

Sure. Post yours and lets see what you might have done incorrectly.

[青风细雨楼]

Hi Dennis,

When I send this command to RS232 port, there is nothing feedback.

1. input ZSWITCHON in the text controller and then click start button to send command to the printer.

2. input J0HELLO in the text controller and click start button to send.

Can you tell me how to solve this problem?

here is my VI.

[Dennis_Knutson]

I don't see anything wrong with the code othjer than you should not be doing a VISA Close inside the case statement. Are you sure the cable type and com settings are correct?

[RavensFan]

Also, it's probably not a good idea to continually set the COM port settings insdie the loop.

[青风细雨楼]

I can connect the printer via VB program but LV can not.

The com setting is correct.

I do not know why?

Do you have any other suggestion?

[simon76]

Try this..