40 • iPro Case Controller I&O Manual FM V1.01
026-1738 Rev 1
13
MODBUS Networking-Master Slave Lineup
When an EEPR is used in the refrigeration system, the case controllers communicate from controller to controller within each lineup.
This is done through the use of RS485 and a local MODBUS network. The device controlling the EEPR is the master controller and the
other devices in the lineup are slave case controllers. The Modbus connection is a local connection that is within each refrigeration
circuit. The Modbus connection does not and should not be extended to all controllers within a store.
13.1.
Wire Types
Emerson specs General Cable 92454A (
Emerson P/N 135-0600
) shielded twisted pair cable for use as MODBUS network wiring.
13.1.1.
Daisy Chain Wiring
The MODBUS network must be wired in a daisy chain topology, no star or T configurations are allowed. Connect the 3-wire connection
from the master case controllers RS485 slave port to each slave case controllers RS485 slave port. See
Figure 13-1
for connection detail:
13.1.2.
Setting the MODBUS Address and Baud Rate
Each device in the local Modbus network must have a unique Modbus address. Because the connection typically begins with the master
case controller and ends with the last slave case controller, the master case controllers address is set to
1
. Each slave case controller is
subsequently addressed
2
,
3
,
4
and so on. A maximum of five slave case controllers can be connected to one master.
Figure 13-1
- Master/Slave Wiring Detail
Summary of Contents for iPro
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