Metrohm 746 VA Trace Analyzer - Manual (Page 576)

8.3 RS232 interfaces
746 VA Trace Analyzer / 747 VA Stand
8-15
746 VA Trace Analyzer as sender:
LF
DCD
CTS
TxD
DCD
CTS
TxD
DSR DSR
RTS RTS
DTR DTR
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 746 VA Trace Ana-
lyzer, handshake outputs (DTR, RTS) are set.
As soon as an LF is recognised, the 746 VA Trace Analyzer sends XOFF. After this
time, it can still receive 6 characters and store them temporarily.
However, the 746 VA Trace Analyzer also sends XOFF when its input buffer con-
tains 80 characters. After this time, it can still receive maximum 2 more characters
(incl. LF).
If the transmission is interrupted for 35 ms after the 746 VA Trace Analyzer has sent
XOFF, the string previously received will be processed even if no LF has been sent.
746 VA Trace Analyzer as receiver:
RxD
TxD
XOFF XOFF XON
L
F
External device
Gerät
400 µ s Process
string
Data
input
Data
output
35 ms
max. 2
char.
Time
80 characters
746
External device 746
Time