Manual
Wiring the RS 485 Modbus Connector for Data Communication to the Conext ComBox
975-0679-01-01 Revision D 2–7
Wiring the RS 485 Modbus Connector for Data
Communication to the Conext ComBox
The RS 485 Modbus connector provides three terminals to wire communication
cables to the Conext ComBox. The five-terminal RS 485 connector uses the first
three terminals for a data cable. The cable has a size of 16–24 AWG with
1.5 mm
2
–0.25 mm
2
wires. The cable can be shielded or non-shielded.
To wire the RS 485 Modbus connector for data communication:
1. Select a two-wire, twisted pair, shielded cable not longer than 164 feet
(50 m). Refer to the local electrical code and application to select the
insulation and temperature class of the cable to be used.
2. Strip 3/8 in.(10 mm) from the end of the wires to be connected and attach
ferrules to the two signal wires (red and black in the following diagram).
3. Insert the ferrules and the shield wire into the connector terminals as shown
in the following diagram.
4. Secure the wires by tightening the screw on the terminal.
The middle terminal is not connected internally but is provided for the shield
connection of the cable.
5. If you intend to use the Dry Contact, go to “Wiring the Dry Contact
Connector”. Otherwise, go to “Connecting the Conext ComBox to an
Ethernet Network”.
S
hi
eld
D0
D1
3/8 in.
(10 mm)
Conext_ComBox_Owners_Guide.book Page 7 Monday, October 21, 2013 10:00 AM