Metrohm 774 - Page 139

5.12 Properties of the RS232 Interface
774 Oven Sample Processor, Instructions for use
133
774 Oven Sample Processor as Sender:
Time
RxD
TxD
Data output
Data input
L
F
L
F
L
F
Data output
disabled
Data output
enabled
Request
1.Line
Response
XON
XOFF
external deviceSample Changer
Changer transmission can be stopped by external instruments with XOFF.
After XOFF is received the changer completes sending the line already
started. If data output is disabled for more than 3 s by XOFF, E43 appears
in the display.
Hardware-Handshake, HWs
774 Oven Sample Processor as Receiver:
Time
DTR
L
F
RxD
Rx D
external deviceSample Changer
DTR
774 Oven Sample Processor as Sender:
Time
RTS
RTS
L
F
TxD
TxD
CTS
CTS
external deviceSample Changer
The data flow can be interrupted by deactivating the CTS line.