Dont expect to connect a printer to your router, atleast not in the near future...
I spoke to the boys at the MUM and their reasons are sound...
Just what printer sould be supported? and do we REALY want the printer spooler / driver code on our ROUTERS ?
It's been a while since i've last worked on them, but most serial POS printers can store templates in their NVRAM, then all that RouterOS has to do is send the pause command and then the print command to the printer together with a few parameters (username, password, uptime limit, system clock time, etc). Since RouterOS has sent the 'pause' command before the print, the printer does not actually print anything. The 'print voucher' button on most hotspot POS printers is usually just a 'pause' button, so when you press 'print voucher' you are actually unpausing the printer, which will print the voucher code details.
一旦凭证打印,打印机returns an 'OK' or similar response back to the PC (or RouterOS in this case), which can then send the new pause + print + parameters command, wait for the next OK to start the process all over again.
I'm 50% sure this can already be done through some intelligent scripting, i've just never had the time (or inclination) to try it out.