Metrohm 730 Sample Changer - Manuel (Page 159)

4.11 Properties of the RS232 Interface
730 Sample Changer, Detailed Description
156
Sample Changer as Receiver:
Time
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
Sample Changer as Sender:
Time
RxD
TxD
Data output
Data input
XON XOFF
max.
4 characters Data output
disabled
L
F
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 char-
acters + 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 proc-
essed by the changer. Afterwards the changer sends XON and is
again ready for receiving.
Sample Changer as Receiver:
XOFF XON
Time
RxD
TxD
Data output
Data input
Input
disabled
LF LF
400 µs String
processing
external device
Sample Changer