Metrohm 774 Oven Sample Processor - Manual (Page 138)

5 Detailed description
774 Oven Sample Processor, Instructions for use 132
774 Oven Sample Processor as Receiver:
T ime
RxD
TxD
Data output
Data input
XON XOFF
60 characters
max. 22
characters
XOFF
Time of
4 characters
String
processing
400 µs
external device
LF
Sample Changer
774 Oven Sample Processor as Sender:
Time
RxD
TxD
Data output
Data input
XON XOFF
max.
4 characters Data output
disabled
LF
Data output
enabled
Sample changer external device
Software-Handshake, SWline
Handshake input ports on the changer (CTS, DSR, DCD) are not checked.
Handshake output ports (DTR, RTS) are set by the changer.
The changer has an input buffer which can accept up to 80 characters +
C
R
L
F
. As soon as an L
F
is recognized, the changer sends an XOFF. After
this, it can receive and save a maximum of 6 characters. The character
string previously sent is now processed by the changer. Afterwards the
changer sends XON and is again ready for receiving.
774 Oven Sample Processor as Receiver:
XOFF XON
Time
RxD
TxD
Data output
Data input
Input
disabled
LF LF
400 µs String
processing
external device
Sample Changer