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8 • MRLDS I&O Manual 026-1307 Rev 3 06-APR-2010

way board (P/N 810-3040). The Gateway board can inter-

face with a site controller as a 16AI or as an IRLDS. If the

site controller is an Einstein or E2, it is recommended to

interface them as an IRLDS. Multiple Gateways can be

used, each with up to 12 connected MRLDS units.

4.3.3 The Gateway Board

The Gateway Board communicates with the MRLDS

via the Modbus network, which is connected to the Gate-

way’s “Receiver Bus” network terminal. The Gateway

communicates with the E2 via the RS485 I/O Network.

4.3.4 Powering the Gateway

Board

The Gateway board requires 24VAC power from a

Class 2 center-tapped transformer. Retail Solutions sup-

plies several sizes of center-tapped transformers for pow-

ering multiple 16AIs, 8ROs, and other RS485 peripheral

boards.

Figure 4-8 shows how to connect the 56VA and 80VA

transformers to the Gateway power connector.

4.3.5 Connecting the Gateway

Board to the Einstein or REFLECS Net-

work

Each E2, Einstein, or REFLECS site controller that

will communicate with one or more MRLDS units must

have a Gateway Board installed on its RS485 I/O Net-

work. For Einstein controllers, this means the Gateway

will be installed on the RS485 I/O Network; for RMCC,

BEC, BCU, and other REFLECS products, the Gateway

will be installed on the COM A or COM D network.

4.3.6 Wire Connections

Using shielded three-conductor network cable (Belden

#8641 or equivalent), connect the RS485 I/O Network

wire to the three-terminal connector on the Gateway board

as shown in Figure 4-9. For further information about

how RS485 networks are configured, refer to your site

Figure 4-7

- MRLDS Gateway Board Layout (810-3040)

CAUTION: 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, Center-Tapped

50/60Hz

Power 5VA

Table 4-4

- Gateway Power Requirements

Three-Board Six-Board

P/N

640-0056 640-0080

Power Rating

56 VA 80 VA

Table 4-5 - Power Ratings for CPC Transformers

Figure 4-8 - Pinout for the 56VA (640-0056) and 80VA (640-

0080) Transformers

CAUTION: The MRLDS unit requires a sepa-

rate Class 2, 24VAC, 10VA power supply.

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