Communication Protocol And Print Buffers; Overview; Figure 21 Typical Pos System; Figure 22 Host To Printer Link - TransAct Ithaca 90PLUS Series Programmer's Manual

Communications

Overview

8

Communication Protocol and Print Buffers

8.1 Overview
The following figure illustrates the communication flow from host computer to printer and from printer to cash
drawer.
Host computer
Host to
keypad
Keypad

Figure 21 Typical POS system

For the host to printer communication link, the Series 90PLUS Printer supports serial or parallel
communications. The serial and parallel ports both follow standards developed for the PC environment.
Host computer

Figure 22 Host to printer link

Page 128
PcOS Series 90PLUS
Host to printer link
Cash drawer
Data to printer
Status and flow control back
Rev Q
Programmer's Guide
Printer
Printer to cash
drawer
Printer
11/07/05