Metrohm 746 VA Trace Analyzer - Manual (Page 577)

8 Technical data
746 VA Trace Analyzer / 747 VA Stand
8-16
746 VA Trace Analyzer as sender:
RxD
TxD
XOFF
L
F
XON
Software handshake with line stop ( SWline )
Handshake inputs are (CTS, DSR, DCD) are not checked at the 746 VA Trace Ana-
lyzer, handshake outputs (DTR, RTS) are set.
The 746 VA Trace Analyzer has an input buffer which can accept a string of up to 80
characters + CR LF. As soon as an LF is recognized, the 746 VA Trace Analyzer
sends XOFF. After this time, it can still receive max. 6 characters and store them
temporarily. The string sent previously is now processed by the 746 VA Trace Ana-
lyzer. It then sends XON and is again ready to receive.
746 VA Trace Analyzer as receiver:
RxD
TxD
XON
L
F
L
F
XOFF
746 VA Trace Analyzer as sender:
RxD
TxD
XOFF
L
F
XON
L
F
L
F
The transmission of the 746 VA Trace Analyzer can be stopped by the external de-
vice with XOFF. After the receipt of XOFF, the VA Trace Analyzer finishes transmis-
sion of the line already started. If the data output is blocked for more than 10 s by
XOFF, the error message
RS IFC.# - ERROR 11
appears in the display.
External device
Data
input
Data
output
Data output free Data output
blocked
max. 4
characters
Time
746
External device
Gerät
Data
input
Data
output
746 input
blocked
Process string 400 µ s
Time
746
External device
Data
input
Data
output
Response 1 st line
Inquiry
Data output of
746 free
Data output of 746
blocked
Time
746