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MRLDS Gateway MRLDS Modbus Version (809-101x) • 9

controller’s user manual.

To connect the Gateway to an MRLDS, feed the wires

through the rectangular opening in the sensor base as indi-

cated in Figure 1-1. Locate the RS485 connector and

secure the wire leads to the connector orienting them as

shown in Figure 4-10. Connect multiple MRLDS units in

a daisy-chain configuration as shown in Figure 4-1.

4.3.7 Termination Settings

As part of a site controller’s RS485 I/O (COM A or

COM D) Network, a Gateway must be terminated if it is

the end device of a daisy chain. The Gateway on the Mod-

bus Network should always be terminated and always

located at the end of the daisy chain.

Refer to the site controller’s user manual for informa-

tion about daisy chain networks and how they are termi-

nated.

To terminate the Gateway (the Modbus jumpers should

always

be terminated on the Gateway), set the receiver bus

jumpers to the RIGHT position (Figure 4-11).

4.3.8 Gateway Board I/O Net

Addressing

Set the address on the I/O Network with switches 1-4.

There can be more than one MRLDS Gateway with each

supporting up to 12 MRLDS units.

Switch 5 indicates whether the MRLDS will be

mapped as an IRLDS or 16AI. Set switch 5 to the OFF

position for IRLDS emulation or to the ON position for

16AI emulation.

Figure 4-9

- Connecting the Gateway to the E2 RS485 Network

Figure 4-10 - Connecting the Gateway to MODBUS

GATEWAY BOARD

-485

+485

To MRLDS

MODBUS

MRLDS - INSIDE LOWER

PORTION OF BASE

GATEWAY BOARD

+485

-485

+485

-485

Shield

drain/ground

wire

Shield drain/

ground

wire

MODBUS

NETWORK

Figure 4-11 -MRLDS Gateway Termination

Figure 4-12 - Network Layout Example

RS485

I/O NET

(TO CPC

CONTROLLER)

RS485 I/O NET

TERM JUMPERS

TERMINATION

(ALWAYS

TERMINATE)

ADDRESS ON

I/O NET

I/O NET MODE

ON = 16AI

OFF = IRLDS

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 21 22

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Emerson MRLDS Spécifications Page 15

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