Metrohm 709 IC Pump - Manual (Page 53)

5.1 RS232 interface
709 IC Pump
45
5.1.11 Setting the baud rate
The baud rate of the RS232 interface of the 709 IC Pump is set to 9600
as standard. If you wish to set a lower baud rate, proceed as follows:
The electronic circuitry of the 709 IC Pump is sensitive to electrostatic
charges. You should thus take the appropriate measures (earthing,
e.g. by touching metal) before opening the instrument.
1 Disconnect cables
Disconnect mains cable from mains connection plug 31 of the
709 IC Pump, also unplug all other cables connected to the rear
of the instrument.
2 Remove housing cover
Unscrew the two fastening screws 25 at the bottom of the
instrument and the two fastening screws 26 at the rear of the
instrument, remove housing cover 27.
3 Set baud rate
Change over blue jumpers at positions P21, P22 and P23 of the
main board (on right side of instrument when viewed from back)
using tweezers or flat-nosed pliers to match the baud rate you
wish:
P21
P22
P23
3 2 1
P21
P22
P23
3 2 1
P21
P22
P23
3 2 1
P21
P22
P23
3 2 1
P21
P22
P23
3 2 1
P2
P2
P2
3 2 1
9600 4800 2400 1200 600 300
4 Replace housing cover
Replace housing cover 27 and fasten with fastening screws 25
and 26.
5 Plug in cables
Connect mains cable to mains connection plug 31 and also plug
in all other cables.