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
To Next Page
Loading...
