Hach 8450, Instrument Manual

Page: 21 / 66

Section 2
Page 21
16116Install.fm
Data Communications
1. Turn the 8400 meter off. Using the extension leads, connect the
milliampmeter in series with the 4-20 mA device (chart recorder, etc.)
(
Figure 15 ).
2. Perform steps 1 through 22 for each channel that will be connected to a
4-20 mA device.
3. Unplug the screw terminal connector with attached Surge Protectors and
remove the extension leads.
4. Observing the correct polarity (+ and –), connect the 4-20 mA device to
the Surge Protector screw terminals and reinsert the terminal plug
assembly.
Figure 15 4-20 mA Device Adjustment Setup
2.8 Data Communications
Data communication configurations for the 8450 monitor include: 1) No
Communications option, 2) RS232 with data logging option, and 3) RS485
with data logging option.
The default communications data format is 9600 baud, 8-bit word, 1 stop bit,
and no parity. Baud and parity can be changed in the COMM menu in the
General menu (see
Table 5 ).
2.8.1 RS232 Communications
Monitors with the RS232 with data logging option can dump data to a
personal computer (PC) or a printer connected to the four-conductor Din
connector at the base of the monitor via Personal Computer Serial Cable
(Cat. No. 16086). The data dump must be initiated at the Residual Chlorine
Monitor by a key sequence at the monitor’s front panel (see
section 3.23.5 on
page 47 ). Serial cable connections are shown in Figure 16 and Table 2 on
page 22 .
Note: To send data to a printer using the PC cable, it may be necessary to swap the
position of the wires connected to pins 2 and 3 at the TB6 terminal block on the
power supply board shown in
Figure 16 . A male to female connector adaptor may
also be required.