TransAct Technologies ITHERM 280 - Manual (Page 301)

iTherm ® 280 Programmer’s Guide Communications
28-07764 Rev C Page 299
Protocol and Print Buffers
The following figure illustrates the communication flow from host computer to printer and
from printer to cash drawer.
Host computer
Printer to cash
drawer
Host to printer link
Cash drawer
Keypad
Host to
keypad
Printer
Figure 21 Typical POS System
For the host to printer communication link, the iTherm
®
280 printer supports serial or
parallel communications. The serial and parallel ports both follow standards developed
for the personal computer environment.