Metrohm 751 GPD Titrino - Manual (Page 183)

3.3 Properties of the RS 232 Interface
751 GPD Titrino
180
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 page 10.
• 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; al-
ways 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 :
max. 128
characters
384 characters
XOFF XON
L
F
RxD
TxD
Data output
Data input
Time
Titrino external device