CPM2A Serial Out to Barcode Reader

Hello BMA,

Welcome to the forum.

Try here for a whole bunch of sample code for using TXD instructions...

http://forums.mrplc.com/index.php?download=288

You will need to register, but this is a very good site for Omron specific Q&A (no disrespect to PLCs.NET of course ).

Actually, that is what I started my TXD rung with. This very same code

Thank you.

Thanks GT,

I tried what you suggested above. I still have not been able to communicate with the reader but I am not sure that I could, even if I have all of my settings correct in my PLC. (I have a few different areas of uncertainty) I am using software: CXONE-AL01C-EV2 Ver.2.11
I changed the Host port settings to match the settings of the barcode reader but they do not appear to save to the PLC. I am confused as to how the port settings in the project menu relate to the port settings you set in the DM memmory?
I made the cable which connects the barcode reader to the PLC. I connected the:
Serial device RD (receive data) --------- Pin2 (SD)
Serial device SD (send data)--------------Pin3 (RD)
Serial device SG (signal ground)--------Pin9 (signal ground)

First thing to do is try your barcode reader on a PC to verify its ok, and everything works using hyperterminal.
If that works fine, then make sure either the reader is connected straight to the Processor or if you need to use an extension cable that its straight through. If there is a DB9 connector on the scanner it may be that its already wired for the crossed connection.

I've used handheld barcode readers on CPM2A's before, the difference in my case is that the operator triggered the read, I didn't have to command the read.
I found it to be a PITA, and would rather use AB for serial communications.

I tried what you suggested above. I still have not been able to communicate with the reader but I am not sure that I could, even if I have all of my settings correct in my PLC. (I have a few different areas of uncertainty) I am using software: CXONE-AL01C-EV2 Ver.2.11
I changed the Host port settings to match the settings of the barcode reader but they do not appear to save to the PLC. I am confused as to how the port settings in the project menu relate to the port settings you set in the DM memmory?
I made the cable which connects the barcode reader to the PLC. I connected the:
Serial device RD (receive data) --------- Pin2 (SD)
Serial device SD (send data)--------------Pin3 (RD)
Serial device SG (signal ground)--------Pin9 (signal ground)

Click to expand...

When you download to the plc make sure you check the Settings box. This will properly set the DM area. It is the same as manually setting those registers.

Next thing to do would be to sort pins 4 and 5 on the Omron side. This is RTS/CTS. You may need to do the same on the barcode reader side. I have had that happen before.

Let me know how you make out. I will be back in the office on Monday and will have reference materials available then.

Well, unfortunately I still have not had any luck yet.

Averellen, I can connect the barcode reader to Microscan's ESP software and enter their terminal screen from there. If I type my command in from the terminal screen, the scanner responds as it should. I have also connected a serial port monitor to my computer to observe all communication....the command is sent exactly as I sent it throught the port and the scanner responds.

GT, I made sure that I connected the RTS/CTS on the plc as the pinout explained. I also connected them on the scanner side as well, although the ms820 handbook does not talk about doing this.
I made sure to check the settings box after changing the comm settings and then saved to the plc. I believed that the comm settings have saved although when I upload back to the PC the settings revert back to default I'm guessing it's supposed to do this?

The comm light on the front panel blinks once after I have pressed my send button, indicating that the TXD function is at least trying to send something....that's all I get so far.

Thank you,
-Bryan

BMA,

Per the manual DM6646 should be 0003, based on:

DM6646 0300 (Baud rate=9,600, Frame Format=1 start bit 7 length 1 stop bit Parity is Even)

Click to expand...

It sounds like the Settings are not being saved.
If you upload them from the plc, they should be as set, not original.
When you download the settings to the plc, make sure the plc is in Program mode. Once downloaded, make sure to cycle power on the plc.

Hope this will help.