16 • RLDS I&O Manual 026-1309 Rev 8
4.2. E2, Einstein, and
REFLECS Controllers
(The RLDS Gateway
Board)
The RLDS may be connected to an Emerson
Electronics and Solutions controller using a Gateway
Board. The Gateway Board is a special interface
device that allows an E2, Einstein, or REFLECS site
controller to communicate with up to three RLDS
units as if each of them were a standard 16AI Analog
Input board, and allows for programming with the
Hand-Held Terminal (HHT).
The Gateway Board communicates with the RLDS
units via the MODBUS network, which is
connected to the Gateway’s “Receiver Bus” network
terminal. The Gateway communicates with site
controllers (E2, Einstein, or REFLECS) via the
RS485 I/O Network (COM A & COM D for
REFLECS).
In addition to being an interface with the site
controller, the Gateway Board also allows you use a
Hand-held Terminal (HHT) device to program the
RLDS and view status.
4.2.1. Powering the Gateway Board
The Gateway board requires 24VAC power from a
Class 2 center-tapped transformer.
Emerson Electronics and Solutions supplies
several sizes of center-tapped transformers for
powering multiple 16AIs, 8ROs, and other RS485
peripheral boards of the E2, Einstein, and REFLECS
systems.
Refer to your controller’s user manual for
information on how to use the center-tapped
transformers listed in Table 4-2 to power multiple
RS485 I/O devices.
Figure 4-7 shows how to connect the 56VA and
80VA transformers to the Gateway power connector.
Figure 4-6 - RLDS Gateway Board Layout (P/N 810-3760)
NOTE: Before installing the Gateway board,
verify that jumper JP7 (if present on the board)
is set to the “NORMAL” position (not the
“TEST” position). Operating the Gateway with
the jumper in TEST position may cause board damage.
Input Voltage 24VAC, Class 2, 50/60Hz
Power 5VA
Table 4-1 - Gateway Power Requirements
Three-Board Six-Board
P/N 640-0056 640-0080
Power Rating 56 VA 80 VA
Table 4-2 - Power Ratings for Emerson Transformers
Figure 4-7 - Pinout for the 56VA (640-0056) and 80VA (640-
0080) Transformers
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