Operation Manual

Product Reference Guide 149
Chapter 5
References
RS-232 Parameters
Handshaking
Hardware handshaking: (RTS/CTS)
The RTS line is activated by the decoder before transmitting a character. Transmission is
possible only if the CTS line (controlled by the Host) is active.
Figure 23. RTS/CTS handshaking
RTS
Transmitted data Transmitted data
TX
CT
S
Ho
st busy
Signals at
EIA levels
Software handshaking: (XON/XOFF)
During transmission, if the Host sends the XOFF character (13 Hex), the decoder interrupts
the transmission with a maximum delay of one character and only resumes when the XON
character (11 Hex) is received.
Figure 24 . XON/XOFF handshaking
Host read
y
Host busy
XON XOFF
RX
T
ransmitted dataTransmitted data
TX