Metrohm 758 KFD Titrino - Manual (Page 134)

3.3 Properties of the RS 232 Interface
758 KFD Titrino
130
3.3 Properties of the RS 232 Interface
Data Transfer Protocol
The Titrino is configured as DTE (Data Terminal Equipment).
The RS 232 interface has the following technical specifications:
• Data interface according to the RS 232C standard, adjustable transfer pa-
rameters, see pages 12 and 113.
• Max. line length: 512 characters
• Control characters: C
R
(ASCII DEC 13)
L
F
(ASCII DEC 10)
XON (ASCII DEC 17)
XOFF (ASCII DEC 19)
• Cable length: max. approx. 15 m
Start 7 or 8 Data Bit Parity Bit 1 or 2 Stop Bit
Only a shielded data cable (for example, METROHM D.104.0201) may be
used to couple the Titrino with foreign devices. The cable shield must be
properly grounded on both instruments (pay attention to current loops; always
ground in a star-head formation). Only plugs with sufficient shielding may be
used (for example, METROHM K.210.0381 with K.210.9045).
3.3.1 Handshake
Software-Handshake, SWchar
Handshake inputs on the Titrino (CTS) are not checked.
Handshake outputs (DTR, RTS) are set by the Titrino.
The Titrino sends XOFF when its input buffer contains 384 characters. After
this it can receive 128 extra characters (including L
F
).
Titrino as Receiver :
Titrino external device
Data output
Data input
max. 128
characters
384 characters
XOFF XON
L
F
RxD
TxD
Time