Supply Power To An External Device (Optional); Connect Units In A Network (Optional) - Hach WPC-21 Manual Del Usuario

Note: The RS232 connection is not available when the digital input (CTS pin) is used.
Figure 5 RJ-45 to DB-9 converter wiring
1 To PC or printer
DB-9 pin
Pin 2 RX
Pin 3 TX
Pin 4 DTR
Pin 5 GND

Supply power to an external device (optional)

+5 VDC or +12 VDC is available on JP1 to supply power to an external device. +5 VDC is supplied
when the jumper is across the +5V pin and pin 2 of JP1. +12 VDC is supplied when the jumper is
across the Vps pin and pin 2 of JP1.
Note: The V+ pin and GND pin on the J1 connector are for Service use only.

Connect units in a network (optional)

Multiple units can be connected together in a network. Use the RS485 connection of each unit and
19 AWG, twisted shielded pair wire to connect the units together.
Notes:
• A maximum of 32 units in a network can be connected to one RS485 network.
• The host computer must have data acquisition software.
• The communication protocol is Modbus. Refer to the WPC Modbus documentation on the
manufacturer's website.
1. On the first unit:
a. Push the incoming cable from the RS232/RS485 converter through a strain-relief fitting.
b. Push the outgoing cable through a strain relief fitting.
c. Connect the incoming and outgoing cable wires to the J4 connector. Refer to
2. On the second unit:
a. Push the incoming cable from the first unit through a strain-relief fitting.
b. Push the outgoing cable through a strain relief fitting.
12 English
2 RJ-45 to DB-9 converter
(SA000070-01)
Table 4 RS232 connections
RJ-45 pin
Pin 3
Pin 4
Pin 5
Pin 8
3 RJ-45 cable (user supplied)
J4 pin
TX
RX
CTS
GND
Table 5.