Metrohm 709 IC Pump - Manual (Page 51)

5.1 RS232 interface
709 IC Pump
43
5.1.8 Data transmission protocol
The RS232 interface of the 709 IC Pump is configured as DTE (Data
Terminal Equipment) with the following technical specifications:
• Standard Data interface in accordance with EIA standard
RS 232C (DIN 66020, page 1)
• Baud rate 9600 (300, 600, 1200, 2400, 4800 can be set
with jumpers on main board, see section 4.1.8)
• Data Bits 8
• Stop Bits 1
• XON/XOFF off
• Control characters C
R
DEC 13 HEX 0D
L
F
DEC 10 HEX 0A
• Max. line length 80 characters + C
R
L
F
• Cable For interconnections of the 709 IC Pump with
non-Metrohm units, only a shielded data cable
(e.g. Metrohm D.104.0201) may be used. The
cable shielding must be faultlessly earthed at
both units (pay attention to current loops;
always use star-head earthing). Only connec-
tors with adequate shielding may be used (e.g.
Metrohm K.210.0001 with K.210.9004).
• Cable length max. ca. 15 m
As only the baud rate of the RS232 parameters of the IC pump can be
set by hardware, all other RS232 parameters of the third-party device
must be matched to those of the pump.
5.1.9 Handshake
The handshake outputs (DTR, RTS) are set by the 709 IC Pump, the
handshake inputs (CTS, DSR, DCD), on the other hand, are not tested.
In practical operation with third-party devices, this has the following
consequences:
• XON/XOFF must be switched off in the third-party device.
• With inquiries of the third-party device to the pump, the re-
sponse of the pump must be waited for before the next inquiry
can be started.