Installation / Operation Instruction Manual

BLP SERIES Install, Operation, and Maintenance Manual
SECTION 3: OPERATION AND CONTROLS
Rev-1 Bradford White • 200 Lafayette St. • Middleville, MI 49333 Page 33 of 83
BrutePlate Manual Phone: [phone] • Website: www.BradfordWhite.com 02/26/2020
3.11 DATA COMMUNICATIONS
BLP Series Water heater control system allows the controller to communicate with external
Building Automation System (BAS) or Energy Management System (EMS). It is compatible with
standard Modbus RTU or TCP/IP and BACnet UDP/IP multi-protocols without the need for
external gateway. Optional gateway is also available for communications with other protocols.
 Communication between HMI and Temperature controller is standard Modbus RTU.
 Use RJ45 port to connect PC or network computer system with PID controller.
WARNING!
 Maximum communication cable lengths without repeater
RS485 Network – 4,000 feet
Ethernet Network – 328 feet
 Communications and power wiring should never be routed together inside same conduit
because it can cause nuisance related issues on communications side.
NOTES:
 To help prevent ground loops, the cable shield should be grounded at one point only.
 Use twisted, shielded-pair communication wiring.
3.11.1 Temperature Controller Terminals Layout
Where HD is Ground, HE (A+) receives data and HF (B-) transmits data