Metrohm 788 IC Filtration Sample Processor - Manual (Page 137)

5.2 RS232 interface
788 IC Filtration Sample Processor
129
788 IC Filtration Sample Processor as sender:
LF
DCD
CTS
TxD
DCD
CTS
TxD
DSR DSR
RTS RTS
The data flow can be interrupted by deactivation of the CTS line.
Software handshake with character stop (SWchar)
Handshake inputs are (CTS, DSR, DCD) are not checked at the 788 IC
Filtration Sample Processor, handshake outputs (DTR, RTS) are set.
As soon as an L
F
is recognized, the 788 IC Filtration Sample Processor
sends XOFF. After this time, it can still receive 6 characters and store
them temporarily.
However, the 788 IC Filtration Sample Processor also sends XOFF
when its input buffer contains 60 characters. After this time, it can still
receive maximum 22 characters (incl. L
F
).
If the transmission is interrupted for the time of 4 characters after the
788 IC Filtration Sample Processor has sent XOFF, the string previously
received will be processed even if no L
F
has been sent.
788 IC Filtration Sample Processor as receiver:
RxD
TxD
XOFF XOFF XON
L
F
External device
400 Ps String pro-
cessing
Data
input
Data
output
Time of 4
char.
max. 22
char.
Time
60 char.
788
External device 788
Time