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
.
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
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
Summary of Contents for 781S
Page 2: ...2 ...
Page 6: ...Introduction Reference Manual May 2020 00809 0600 4410 6 Emerson com ...
Page 20: ...Configuration Reference Manual May 2020 00809 0600 4410 20 Emerson com ...
Page 34: ...Installing the Gateway Reference Manual May 2020 00809 0600 4410 34 Emerson com ...
Page 44: ...Operation and maintenance Reference Manual May 2020 00809 0600 4410 44 Emerson com ...
Page 67: ...Reference data Reference Manual May 2020 00809 0600 4410 54 Emerson com ...
Page 68: ...Quick Start Guide 00825 0600 4410 Rev AA March 2020 Emerson Wireless 1410S Gateway ...
Page 93: ...7 5 Declaration of Conformity Quick Start Guide March 2020 26 Emerson com ...
Page 94: ...March 2020 Quick Start Guide Quick Start Guide 27 ...
Page 95: ...Quick Start Guide March 2020 28 Emerson com ...
Page 98: ...Quick Start Guide 00825 0700 4410 Rev AA March 2020 Emerson Wireless 781S Smart Antenna ...
Page 112: ...Quick Start Guide March 2020 16 Emerson com ...
Page 113: ...March 2020 Quick Start Guide Quick Start Guide 17 ...
Page 115: ...March 2020 Quick Start Guide Quick Start Guide 19 ...
Page 116: ...Quick Start Guide March 2020 20 Emerson com ...
Page 118: ...Quick Start Guide March 2020 22 Emerson com ...
Page 119: ...March 2020 Quick Start Guide Quick Start Guide 23 ...
Page 130: ...Redundant Gateway systems Reference Manual May 2020 00809 0600 4410 64 Emerson com ...