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22 • XEV22D I&O Manual 026-1206 Rev 3 13-DEC-2012

19 ECT MODBUS

Networking to

E2s

19.1.COM Port Associations

- E2 Versions 3.xx and

Below

Connecting an XEV22D controller to an E2 re-

quires the E2 to be version 2.84 or above. Contact Re-

tail Solutions for upgrade information if the controller

is a version before 2.84.

An E2 has up to three COM ports that can be as-

signed for MODBUS communication: COM2, an

RS485 port on the E2 power interface board, and

COM4 and COM6, which are optional ports requiring

expansion cards.

COM4 is recommended for MOD-

BUS connection of Emerson units.

Connect the MODBUS network cable to the three-

terminal connector on the COM port you wish to as-

sign as MODBUS. Reverse polarity of +/- on RS485

cable from E2 to the device.

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. En-

sure your E2 is equipped with an RS485 COM Card

(P/N 637-4890) and configured in E2 General Servic-

es (, 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-

terminal connector on the COM port you wish to as-

sign as MODBUS. Reverse polarity of +/- on RS485

cable from E2 to the device.

Figure 19-1 - Location of E2 COM Ports (E2 Versions 3.xx and

Below)

Figure 19-2 - MODBUS Networking

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Emerson XEV22D Dokumentacja Strona 28