Welcome to EpoS Wizard!
I have to install an Epson TM-T88V as additional kitchen printer on an Uniwell DX915-03. Until now, there was only one serial printer (Epson TM-T88IV) for both receipts (sale & kitchen).
The interface type is at these Epson printers exchangeable. In my situation, I can chose out of there different connection technologies, "normal" serial RS-232, "very special" RS-485, and Ethernet RJ45. (The other available technologies on these Epson TM printers like USB aren't possible because the DX915 haven't the corresponding interfaces.)
Well, the kitchen is (from the till) not so far away. I think its no more than 4 meters. There is an "ductwork" / empty tube for the cable available. According to the most quotes in the web, the "strange" RS-485 interface seems to be the most robust one, while normal RS-232 may be possible only on short distance. The third option Ethernet RJ45 seems to be in this use only rarely common and is probably more tricky to configure...
Because the new Epson TM-T88V printer is serial, I will try first that one. It is recommend to reduce the transfer rate to 57.600 bit/s? Does anyone knows which System Function Flags I have to modify at the Uniwell DX915-03?
Unfortunately i can't help with the uniwell set up, but as far as cabling goes, rs-232 can go at least 50 metres with no problems. In fact, before cat5, rs-232 was used for basic 'networking' over much longer distances (i'm not talking about tills there though).
I would recommend serial over a short distance like that - as long as the cable is good quality then you should be fine. The easiest way would be to use a matched pair of adaptors (DB25M to RJ45 and RJ45 to DB9M) and then use a long Cat-5 patch cable for the run itself. Bear in mind a couple of things;-
The printer you have there is a thermal one, so you need to make sure it is in a cooler part of the kitchen or the paper will start to turn black due to the heat in the kitchen.
The serial cable is non-standard spec so you will need the correct pin-outs to make it up
As for the baud rate, you may as well drop it down to 19.2k as this is the normally used setting for attached printers and you probably won't notice anything faster at the printer end.
Many thanks for these information. Will try it as mentioned / suggested. It seems that the special uniwell serial cable "layout" will make everything somewhat more complicated... 
