TransAct Technologies ITHERM 280 User Manual
Page 312
Communications
iTherm
®
280 Programmer’s Guide
Page 310
Rev C
28-07764
Serial
Communications
Port
Data
Buffer Getting Full
Buffer Getting Empty
Data
Select Key
Printer Control
Software
Buffer
40 - 8K
RTS = Request to Send DTR = Data Terminal Ready
Data In
Serial
Data Out
(Not Used for
Flow Control)
DTR
RTS
Send
XOFF
Send
XON
Send
XON or XOFF
Inquire
Commands
Data
ENQ Response
Data
ENQ
Proc.
Figure 27 XON/XOFF Serial Port Flow Control