User`s manual

Watlow EZ-ZONE™ Communications • 5 • Chapter 2 Mobbus RTU & TCP
If your model number has a two in the identified placeholder (PM_ _ _ _ _- [2] _ _ _ _ _ _) then these de-
faults apply.
Port 1 = Standard Bus
Address ([Ad;S]) = 1
Port 2
Protocol ([PCoL]) = Modbus
Address ([Ad;M]) = 1
Baud Rate ( [bAUd]) = 9600
Parity ([PAr]) = none
To change or view the PM communication defaults follow the steps below:
1. Push and hold the up and down arrow keys on the front panel for six seconds to go the the Setup Menu.
2. Push the up or down arrow key until [`CoM] (Communications Menu) appears in upper display and
[`SEt] in the lower display.
3. Push the green Advance Key ‰ to select port one or two. The upper display shows [1], and the lower dis-
play shows [CoM]. Use the up arrow key to change the port number and then push the green advance
button to proceed.
4. If you pushed one above (for port 1) the top display will indicate the Standard bus address [1], and the
lower display will show [Ad;S]. Use the up arrow key to change the Standard bus address.
If you pushed two above (for port 2) in step three the keystrokes defined above for option 1 beginning at
step four would then apply.
When two ports are available as the above part number indicates, port one will always be Standard bus
with no option to change. Standard bus is used to interface with Watlow's EZ-ZONE
TM
configuration software
and is also used when a controllers firmware is flashed to a new revision. The key strokes to view and change
these parameters differs slightly from the above example due to the additional port. See below:
User Programmable Memory Blocks
EZ-ZONE™ PM models equipped with the Modbus protocol (PM_ _ _ _ _- [1, 2, or 3] _ _ _ _ _ _) features
a block of addresses that can be configured by the user to provide direct access to a list of 40 user configured
parameters. This allows the user easy access to this customized list by reading from or writing to a contiguous
block of registers.
In an attempt to make this concept easier to understand it would be best to define the column headers be-
low before we go further.
Assembly Definition Addresses - Fixed addresses used to define the parameter that will be stored in the
"Working Addresses". May also be referred to as a pointer. The value
stored in these addresses will reflect (point to) the Modbus address of a
parameter within the PM control.
Assembly Working Addresses - Fixed addresses directly related to their associated "Assembly Definition
Addresses" (i.e., working addresses 200 & 201 will assume the parameter
pointed to by definition addresses 40 & 41) used in the main body of
your user program to read from or write to a factory default parameter
or a user configured parameter.
So, when the Modbus address of a target parameter is stored in an "Assembly Definition Address" its corre-
sponding working address will return that parameter’s actual value. If it’s a writable parameter, writing to its
working register will change the parameter’s actual value. The list below reflects the Assembly Definition Ad-
dresses as well as their associated Assembly Working Addresses.