3.3 Properties of the RS 232 Interface
Titrino as Receiver :
Titrino
RxD
TxD
Titrino as Sender :
Titrino
RxD
TxD
Software-Handshake, SWline
126
max. 22
60 characters
characters
Time of 4
XOFF
characters
XOFF
max. 4
characters
Handshake input ports on the Titrino (CTS, DSR, DCD) are not checked.
Handshake output ports (DTR, RTS) are set by the Titrino.
The Titrino is equipped with an input buffer that can accommodate a string of
up to 80 characters + C
XOFF. After this, it can receive maximum 6 extra characters and store them.
The string sent previously is now processed by the Titrino. Afterwards, the Ti-
trino sends XON and is again ready to receive.
L
XON
String is
processed
Time
XON
L
F
Data output
Data output
disabled
enabled
Time
L
. As soon as an L
is recognized, the Titrino sends
R
F
F
external device
F
Data output
XOFF
Data input
400 µs
external device
Data output
Data input
794 Basic Titrino