Communication - Thermal Solutions Boiler Control TSBC Instruction Manual

Installation

Communication

The Peer-To-Peer or Modbus networks allow boiler information, including modulation rate and on/off commands, to be
sent via a standard phone cable thus avoiding the cost, time and complexity of wiring multiple signals.
When Wiring Modbus Communication to a Building Automation System (BAS)
The Modbus communication connects to the same RJ11 port that is used by the peer-to-peer communication. Connect
one end of the RJ11 cable to the TSBC and cut off the other end of the cable to access the individual conductors. The
TSBC is a 2 wire Modbus communication. Connect the "A" and "B " terminals of a four wire or six wire phone cable (as
shown below) to the BAS terminals. The TSBC includes two sets of A and B connections, where the A represents the
active transmission state of the RS485 transmitter (as opposed to the line idle state). You need only to wire to one of the
"A" terminals and one of the "B" terminals.
Phone cable signals (4 wire) - connect to pin black or yellow and red or green:
Wire Slot Connection
Color Number
Black 1 A
Red 2 B
Green 3 B
Yellow 4 A
Notes
1. Use standard phone cables (although ones that have all six wires terminated at each end) and splitters to connect each boiler.
2. Please note that all connections between boilers must be kept as short as possible. The maximum cable length between boilers must be
kept under 25 feet (average distance between all boilers).
3. In all cases, the wires should be routed away from any obvious sources of electrical noise or magnetic fields (motors, fluorescent lights,
contactors, spark generators, etc.). Use a separate conduit and junction box from the power wiring.
4. TSBC power supply common must be grounded at each boiler to enable network communication.
TSBC Instruction Manual Page 23 of 48