Can not print to EPSON TM-U295

Epson installed driverGeneric Text PrinterCom1 port in Device ManagerHi,
 
I have Epson TM-U295 Slip POS Printer and I can't make anything print to this printer from any computer that I have tried so far. It has RS232 port in the back and I have tried both USB to 25-pin RS232 cable and 9-pin serial to 25-pin serial null modem cable, but no such luck.
Here is the link that shows the pictures of the front and back of the printer.
Epson TM-U295 FrontEpson TM-U295 Backhttps://www.unicompparts.com/printers-hardware-c341/refurbished-used-printers-c513/epson-tmu295-receipt-printer-used-refurbished-p3026
I installed EPSON driver and it did not work. I tried to create a generic text printer and selected COM1, but that did not work either.
The printer can test a test page when holding down "Forward" button while powering it on. So I know the printer is in good shape.

At this point, I like to know if my cable is the right one or not.
Is there any way that I can check to see if I can test to see if my computer can communicate with the device connected to COM1 port?
sgleeAsked:
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hdhondtConnect With a Mentor Commented:
With serial ports, there are 2 main issues.

1. You may or may not need a cross-over cable. Unless you use the correct cable, you will have the TX pin on the PC talking to the TX pin of the printer, instead of its RX pin. Some control wires also need to be crossed over. A cross-over cable is sometimes called a "null modem".
2. You need to make sure the port settings correspond with the printer's settings. Port settings can be changed by clicking the "Configure Port button". The printer's settings can be changed from "Memory switch setup mode". For details on printer setup, see page 3-19 of the User's Manual.
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sgleeAuthor Commented:
Thanks for posting the manual. It appears that you need a PhD degree to understand how to operate this printer.
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hdhondtCommented:
Serial communication needs some understanding that's as rare as the actual ports, these days.
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sgleeAuthor Commented:
I won’t be able to understand the manual. Do you think I need to start messing with dip switch?
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pgm554Commented:
Should be a diag page you can print from the printer showing you serial port settings.
Make sure they match the software settings of the OS.
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hdhondtCommented:
The manual is confusing. There are 2 sections that relate to serial port settings. On pg 3-15 DIP 1 sets the port settings for the serial model. According to that table I would suggest setting DIP 1 to "off" to get the fastest speed (9600 baud). Then make sure the driver settings (under Configure Port) are the same.

DIP 1 off selects 9600 baud, DTR handshake, 8 bits, odd parity, no parity check. In the driver you then  need to select 9600 for "bits per second", "hardware" for "Flow control", 8 data bits and odd parity.

However, starting on pg 3-21 of the manual there is a much more complicated list of instructions for changing the serial port settings of the model with parallel/USB/ethernet/serial ports. If your model has more than just a serial port you may need to go through these. If serial only, I'm guessing you can ignore them. Of course, if the printer has any other i/f besides serial, I would strongly suggest using that instead of serial.
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sgleeAuthor Commented:
The null modem cable took care of the problem.
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