Protocol And Print Buffers; Figure 14 Typical Pos System - TransAct Ithaca 280 Programmer's Manual

Communications

Protocol and Print Buffers

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 14 Typical POS System

For the host to printer communication link, the iTherm
parallel communications. The serial and parallel ports both follow standards developed
for the personal computer environment.
28-04430
iTherm
Host to printer link
Cash drawer
®
280 printer supports serial or
Rev K
®
280 Programmer's Guide
Printer
Printer to cash
drawer
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