Hach Met One 6000 Series User Manual page 21

Network wiring
RS485 (EIA-485) supports up to 32 instruments (12 K load each). Use a high grade wire
for serial communications such as Belden 9841. The manufacturer recommends that the
length of the network does not exceed 1200 meters.
A typical network wiring diagram for the particle counter is shown in
remote counters can be in the network using RS485 Modbus or FXB communication.
1 Particle counter
2 Particle counter
3 To additional particle counters
4 PC
Table 2 Terminal assignments—RS485 output
Terminal
1
2
3
4
5
6
7
8
9
10
Figure 11 Network wiring—10-pin connector
5
6
7
Assignment
Common (shield ground)
Power source (9–28 VDC, 1 A maximum)
Cable
RS232 to RS485 converter
Network cable
Installation
RS485 A
RS485 B
RS485 A
RS485 B
NC
Pump TD
Pump RD
Common
Figure 11. Up to 32
19