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4 • MRLDS I&O Manual 026-1307 Rev 4 28-JUN-2011

in E2 General Services (, Serial tab) to

enable COM4 or an E2 Expansion COM Card (P/N 637-

4871) to enable COM6.

Connect the MODBUS network cable to the three-ter-

minal connector on the COM port you wish to assign as

MODBUS. Wire RS485+ to the MRLDS+ RS485- to the

MRLDS- and the shield cable to the MRLDS GND.

3.1.2 COM Port Associations - E2

Versions 4.0 and Above

An E2 has three COM ports that can be assigned for

MODBUS communication (COM2). COM ports can only

be used for one function; in other words, if COM2 is set up

as the I/O network, you cannot connect MODBUS devices

to COM2. Ensure your E2 is configured in E2 General

Services (

, Serial tab) to enable COM4 or

COM6.

Connect the MODBUS network cable to the three-ter-

minal connector on the COM port you wish to assign as

MODBUS. Wire RS485+ to the MRLDS+ RS485- to the

MRLDS- and the shield cable to the MRLDS GND.

3.1.3 E2 Termination

For E2 versions 3.xx and below, if the E2 will be the

first device in the daisy-chain, set the port’s termination

jumpers to the TERMINATED & BIASED position (all

three jumpers UP); otherwise, set all jumpers DOWN if

not the first device.

For E2 versions 4.0 and above, if the E2 is the begin-

ning of all RS485 I/O or MODBUS Networks, all three of

these jumpers should be set to the UP position. For MOD-

BUS, the jumpers should all be in the top-most position

(MOD). For I/O Net, the jumpers should be in the middle

position (I/O). For no termination, set the jumpers to the

down position (NO).

3.2 E2 Setup of MRLDS

3.2.1 Set Up Network Ports

Before setting up a MRLDS, the port on the E2 that

has the MODBUS cable connected must be set up as a

MODBUS port.

1. Log in to the E2 with Level 4 access.

2. Press

 followed by  - Gener-

al Controller Info.

3. Press

+ to open the Serial tab of the

General Controller Info setup screens:

Figure 3-2

- Location of E2 COM Ports - E2 PIB Board (E2

version 4.0 and above)

E2 PIB COM PORT ASSOCIATIONS

COM1

Serial Device

RS232 Port

POWER INTERFACE BOARD

(PIB)

E2 Enclosure (Right Side)

COM2 COM6 COM4

Serial Device

RS485 COM Ports

Plug-In

Modem

Card

COM3

Figure 3-3 - MRLDS MODBUS Network Layout

MRLDS

MODBUS

(Up to 12 MRLDS

units on the network)

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 25 26

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Emerson MRLDS Especificações Página 10

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