Emerson Process Management Wireless Gateway 1420 User Manual
Page 11
Quick Installation Guide
00825-0100-4420, Rev CA
June 2007
1420 Wireless Gateway
11
S
TEP
4
CONTINUED
...
Connect to Information System
1. Wire the 1420 Primary Ethernet output or Serial Output connection to the Host System
Ethernet or Serial input connections.
2. For Serial connections, connect A to A, B to B and make sure all terminations are clean
and secured to avoid wiring connection problems.
Figure 1. 1420 Terminal Block Diagram
BEST PRACTICE
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.
NOTE:
In most systems, A = Tx + and B = Rx -. In some systems, this is reversed. For 4-wire
systems, see Figure 2.
Figure 2. Typical Full Duplex (4-wire) to Half Duplex (2-wire) Conversion Diagram
Confirm wiring configuration with host system documentation.
Supply Power
After mounting is complete supply power to the 1420 according to the following steps:
1. Ground the 1420 using suitable grounding methods. There is a case ground lug located
near the terminal block, and an external ground lug located near the conduit entries on
the bottom of the housing.
2. Connect the 24 V DC power wiring to the Power Input terminals in the 1420. The 1420
requires 500 mA of current. (see Terminal and Integration Diagram on page 14)
3. Close the terminal cover and tighten securely.
BEST PRACTICE
Use an uninterruptible power supply (UPS) to ensure that the network is still
functional should there be a loss of power.
+
+
+
+
+
-
-
-
-
-
A
B
S
S
S
S
24 V DC
Power Input
Serial
Modbus
Not Used
Not Used
Not Used
Not Used
Case
(Covered)
S
POE
P2
P1
(Secondary)
(Primary)
Tx +
Tx + = (A)
Rx +
Tx -
Rx -
Rx - = (B)
1420_QIG_Rev_CA.fm Page 11 Thursday, June 7, 2007 1:18 PM