Emerson XM678D - E2 Device Setup for MODBUS; Setting Up E2 Network Ports; Adding and Connecting Devices to E2

E2 Setup of Devices ECT MODBUS Networking to E2s • 41
Connect the MODBUS network cable to the three-
terminal connector on the COM port you wish to
assign as MODBUS. Reverse polarity of +/- on
RS485 cable from E2 to the device
23.2.E2 Setup of Devices
23.2.1. Set Up Network Ports
Before setting up a device, 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  - General
Controller Info.
3. Press
+ to open the Serial tab of the General
Controller Info setup screens:
4. This screen will have a “Connection” field for all
COM ports on the E2. Highlight the COM port
connection field that will be used for the device, and
press
 - LOOK UP. From the list of network
types, select MODBUS.
5. Four fields will become visible underneath the
COM port connection field, which pertain to the
way the device communicates:
• Baud - Default setting is 19.2K. The baud rate
setting should be set to match the baud rate of the
XM678D device (19.2K). (All devices connected to
the same COM port should be set to the same baud
rate.)
• Data Size - Leave this field at the default value (8).
• Parity - Leave this field at the default value (None).
• Stop Bits - Leave this field at the default value (1).
6. Press
 to save changes and exit.
23.2.2. Add and Connect the Device
To enable communications between E2 and the
XM678D units, the devices must be added and
addressed in E2.
1. Log in to the E2 with Level 4 access.
2. Press
 - Connected I/O Boards
and Controllers.
3. In the Num Network Ctrls: NetSetup screen, under
the ECT tab, enter the number of devices in the
Quantity field. (Max shows the maximum number
of devices allowed on the network.)
4. Press
 to return to the Network Setup menu,
then select
 - Network Summary.
5. Locate the units you added to the network list (press
 and  to scroll through the list). If desired,
enter a new name for each device in the Name field.
Figure 23-4 - MODBUS Networking
Figure 23-5 - Serial Communications Manager Screen
E2
XM678D
#1 #3
TERMINATED,
BIASED
(ALL 3 JUMPERS
IN UP or MOD POSITION)
XM678D
XM678D
Figure 23-6 - Num Network Ctrls: NetSetup Screen