Emerson MRLDS operation manual Gateway Board I/O Net Addressing, Termination Settings

controller’s user manual.

GATEWAY BOARD

-485

0v

+485

Figure 4-9- Connecting the Gateway to the E2 RS485 Network

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.

	RS485 I/O NET
	TERM JUMPERS
TERMINATION	RS485
	I/O NET
(ALWAYS	(TO CPC
	CONTROLLER)
TERMINATE)

Figure 4-11-MRLDS Gateway Termination

4.3.8Gateway 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.

GATEWAY BOARD

MRLDS - INSIDE LOWER

PORTION OF BASE

A B		DNG
-	+
485	5	ARTHE ACN 24VAC
	8
	4
S	RS
R
MODBUS		Shield
		drain/ground
NETWORK
		wire

To MRLDS

MODBUS

-485 0v

+485 Shield drain/ ground wire

-485

0v +485

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.

I/O NET MODE

ON = 16AI

OFF = IRLDS

Figure 4-10- Connecting the Gateway to MODBUS

4.3.7Termination 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).

ADDRESS ON
I/O NET
14	15

Figure 4-12- Network Layout Example

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