Technical data

36 • XM670K-XM679K I&O Manual 026-1218 Rev 0 19-DEC-2012
22 ECT MODBUS
Networking to
E2s
Connecting a XR670K - XR679K controller to an
E2 requires the E2 to be version 2.84 or above. Con-
tact Emerson Retail Solutions for upgrade informa-
tion if the controller is a version before 2.84.
22.1.COM Port Associations
- E2 Versions 3.xx and
Below
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 XR670K - XR679K units.
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 Ser-
vices (
, Serial tab) to enable COM4 or
an E2 Expansion COM Card (P/N 637-4871) to en-
able 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.
22.2.COM Port Associations
- E2 Versions 4.0 and
Above
Figure 22-1 - Location of E2 Com Ports - E2 PIB Board (E2
versions 3.xx and Below)
E2 PIB COM PORT ASSOCIATIONS
COM1
COM4
COM6
COM2
Serial Device
RS485 COM Port
(2 Connectors)
RS485 COM Card
(2 Connectors)
Serial Device
RS232 Port
POWER INTERFACE BOARD
(PIB)
E2 Modem/Expansion
COM Card Mounted
Above PIB
Plug-In
Modem
Card
COM3
E2 Enclosure (Right Side)
RS485
RS232
Figure 22-2 - MODBUS Networking
Figure 22-3 - Location of E2 Com Ports - E2 PIB Board (E2
versions 4.0 and Above)
E2
XR670K/
XR679K
#1
TERMINATED,
BIASED
(ALL 3 JUMPERS
IN UP POSITION)
XR670K/
XR679K
#2
XR670K/
XR679K
#3
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