Emerson 1410S - Operation Verification and Certifications; Verifying Gateway Operations

Figure 3-5: Emerson 1410S Gateway and Two 781S Smart Antennas
A. Emerson Wireless 781S Smart Antenna
B.
Attach shield pair cable (Belden 3084A or equivalent)
C. Emerson Wireless 781S Smart Antenna
D. Tape back shield wire and foils
E. Emerson Wireless 1410S Gateway
3.6.4 RS-485
The Gateway can be ordered with an optional RS-485 (serial) connection (see Figure 3-4.
Modbus
®
terminals are labeled A and B on the wiring diagram. This connection is used to
communicate Modbus RTU on an RS-485 data bus.
Use 18 AWG single twisted shielded pair wiring to connect the Gateway to the RS-485 data
bus. The total bus length should not exceed 4000 ft. (1220 m). Connect the Tx - (negative,
receive) wire to terminal A and the Rx + (positive, transmit) wire to terminal B. The wiring
shield should be trimmed close and insulated from touching the Gateway enclosure or
other terminations.
If the existing data bus uses a 4-wire Full Duplex configuration, see Figure 3-6 to convert to
a 2-wire Half Duplex configuration.
Figure 3-6: Convert from Full to Half Duplex
Tx
Rx
Tx
Rx
(A)
(B)
Installing the Gateway Reference Manual
May 2020 00809-0600-4410
28 Emerson.com