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Reference Manual

00809-0200-4420, Rev HB

Section 3: Mounting and Connection

January 2015

Mounting and Connection

Figure 3-6. Terminal Block Diagram

Ethernet connections should use Cat5E shielded cable to connect to an Ethernet hub, switch, or

router. The maximum cable length should not exceed 328 ft. (100 m).

Note

Unless dual Ethernet ports were specified at the time of order, the secondary Ethernet port

(Ethernet 2) will not be active.

3.4.3 RS-485

The Gateway may be ordered with an optional RS-485 (serial) connection (Figure 3-6). It is

referenced by the A and B Serial Modbus terminals. 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 + (positive, transmit)

wire to terminal A and the Rx - (negative, receive) 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 3-7 to convert to a

2-wire Half Duplex configuration.

Figure 3-7. Convert from Full to Half Duplex

24 VDC

(nominal)

Power Input

Serial

Modbus

Not

Case

(Covered)

Ethernet 2

with Power

Ethernet 2

Ethernet 1

(Secondary) (Primary)

(A)

(B)

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Rosemount Smart Wireless Gateway Spezifikationen Seite 28