SmartPlate EV Installation, Operation and Maintenance Manual
CHAPTER 2
– INSTALLATION
OMM-0147_C
• SP-102 • 3/2/2021 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
18
of
72
2.6.1
Modbus Connection
All SmartPlate EV Control Systems includes a Temperature Controller, which is equipped with a
Communications Board that allows connection to Modbus networks. The required signal
connections will depend on the ports available on the Energy Management System (EMS),
Building Automation System (BAS), or Computer being used with the ECS II.
CAUTION!
DO NOT
route Modbus communication wiring in the same conduit as power wiring. Attempting
to do so may result in excessive noise on the signal lines. Also, ensure that the RS485 signal
cable connections do not exceed 4,000 feet maximum.
MODBUS WIRING CONNECTIONS Instructions
1. Refer to Table 2-1, below, and connect the appropriate wire leads to the Temperature
Controller terminals listed. Refer to the Temperature Controller pinouts shown in Figure 2.6.1
to locate the required terminals. Also, refer to Appendix A for instructions on how to change
the Temperature Controller Modbus address, a listing of active Modbus data addresses for
the Controller, and how to change the baud rate. In addition, the documents referenced in
this Appendix provide additional communication information related to Modbus.
NOTE:
AERCO recommends that shielded, twisted-pair cable be used for communication wiring.
Examples of suitable wiring are: Belden 9841, 8761, 3105A, or equivalent.
TABLE 2-1. Modbus Communication Signal Connections
TEMP. CONTROLLER
RS485
SIGNAL NAME
PIN NO.
SIGNAL NAME
PIN NO.
COMMON
JD
COMMON
COMMON
RECEIVE
JE
TRANSMIT
A(-)
TRANSMIT
JF
RECEIVE
B(+)
