Watlow Addendum to EZwarePlus - Manual (Page 10)

In such a system the Silver Series EM OIT is connected to and configured to communicate with the
gateway. The gateway presents itself as a single device on the Modbus network; the OIT does not
communicate with the controllers, only with the gateway. The gateway is configured by the user with an
address offset for each controller connected to it. That address offset is added to the parameter addresses
for the controller.
For example, consider three EZ-ZONE PM controllers connected to an RUI Gateway configured with an
offset of 0 for the first controller, 5000 for the second controller and 10,000 for the third controller. The
table below indicates the addresses that must be entered in EZwarePlus to access the set point value in
the three PM controllers.
PM Set Point Plus Gateway Offset
Convert Relative
Address
Enter in
EZwarePlus
1 2172 2172 + 0 2172 + 1 2173
2 2172 2172 + 5000 7172 + 1 7173
3 2172 2172 + 10000 12172 + 1 12173
Data Types
The Silver Series EM OIT’s Modbus drivers support a variety of data types. The Watlow manuals
specify the data type of each parameter. However the terminology is not precisely the same. The table
below correlates the data types indicated in the Watlow documentation with the data types you should
select when configuring a screen object in EZwarePlus.
EZ-ZONE User’s
Manuals
EZ-ZONE ALL
Modbus List
EZwarePlus
uint
Enumeration,
unsigned 8-bit,
Event,
unsigned 16-bit
16-bit Unsigned
dint signed 32-bit 32-bit Signed
float IEEE Float 32-bit Float
Important Things to Know
Note: Make sure the Modbus Word Order is set to Word Low High in the controller.
That is the setting that works with the Silver Series EM OIT.
Note: Examples in this manual use the map 1 addresses. If the controller’s Data Map is
set to 2, the examples may not work.
Caution: When using a multi-state switch object to set an enumerated parameter in a
controller, each time the user clicks the switch, the setting selected by the switch
is sent to the controller. When it is desirable to go directly from one setting to
another without intermediate settings, use a set word object or an option list to
set the parameter instead.
Silver Series EM OIT  10  Watlow Addendum