Commercial Grade ECR! The SAM4s ER-5215M keyboard is expandable from 5 to 15 NLU keys. NLUs access PLU memory and functions as traditional departments. Functions can be added, removed or relocated for maximum operator efficiency. The affordable SAM4s ER-5215M provides the gateway to system features using two standard RS-232C communication ports: Direct or Modem PC Communications with Optional Polling Software, Kitchen Printer, Slip Printer, Scanner, Pole Display, Coin Dispenser, Scale, Video Surveillance, DataTranTM Integrated Credit.