Ethernet; Wireless Ethernet - Emerson 1420 Reference Manual

1420 Wireless Gateway
Figure 3-4. Typical Full Duplex
(4-wire) to Half Duplex (2-wire)
Conversion Diagram

Ethernet

Wireless Ethernet

3-6
BEST PRACTICES
Typically, twisted shielded pair cable is used to wire the Serial
connection. Standard practice is to ground the shield on the Serial
Host side and leave the shield floating on the 1420 side. Be sure to
insulate the 1420 shield to avoid grounding issues.
HINT/TIP
In most systems, A = Tx + and B = Rx -. In some systems, this is
reversed. For 4-wire systems, see Figure 3-4.
Tx +
Rx +
Tx -
Rx -
Confirm wiring configuration with host system documentation.
NOTE:
Do not open the 1420 electronics housing in an explosive atmosphere.
The 1420 Wireless Gateway is equipped with two 10/100 Base-T Ethernet
interface receptacles on the left side of the terminal block (Figure 3-1 on
page 3-4). When installing the gateway, you may connect the 1420 Wireless
Gateway to an existing Ethernet Hub, Switch or Router.
The primary Ethernet port (P1) is used to connect to the Information System,
specifically a Remote Interface Machine, an OPC Proxy Machine (and an
OPC Application Machine), or a Modbus TCP Application Machine. This can
be done over a non-encrypted Ethernet connection or over an encrypted
Ethernet connection using the Security Setup application.
SECURITY
The most secure option is to connect over an encrypted Ethernet
connection using the Security Setup application.
The second Ethernet port (P2) on the 1420 Wireless Gateway terminal block
is an optional factory-configured redundant Ethernet port. (ordering option
Output Code 2)
The 1420 Wireless Gateway is capable of communicating to the Information
System via a Wireless Ethernet connection. This allows for greater flexibility in
placement of the gateway with the same functionality as a standard Ethernet
connection.
To install a wireless ethernet connection, simply mount the 1420 Wireless
Gateway, then mount the wireless antenna. Remove the cap from the Power
Over Ethernet (POE) receptacle and connect the antenna cable to the POE
receptacle (Figure 3-1 on page 3-4).
Reference Manual
00809-0100-4420, Rev BA
Tx + = (A)
Rx - = (B)
August 2007