AERCO XPC GATEWAY Communications - Manual (Page 34)

GATEWAY COMMUNICATIONS MANUAL
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SECTION 2 INTERFACING THE XPC WITH C-MORE CONTROLLED UNITS
2.1 INTRODUCTION
The AERCO XPC Gateway can be connected to any C-More-controlled gas-fired boiler or water heater.
The XPC is configured to work in a “plug-and-play” fashion with AERCO equipment utilizing Modbus
(RS485) communication. The default Modbus communication configuration for all AERCO equipment is
Modbus RTU, 9600 baud, 8 data bits, 1 stop bit, and no parity.
The information in this Section provides basic planning set-up and programming details for implementing
a communication network utilizing the AERCO XPC Gateway with up to 12 C-More controlled boilers or
water heaters. Network control and monitoring is provided by a Master third-party BAS or EMS. Set-up
information for the Master BAS/EMS is provided in the AERCO XPC Gateway Integration Guide, included
as Part II of this manual.
2.2 PHYSICAL NETWORK WIRING
All signal wiring connections between the AERCO XPC Gateway and other AERCO equipment should be
implemented using shielded, twisted-pair wiring from 18 to 24 AWG. Examples of suitable wire types are:
Belden #9841, #8761, #3105A, or equivalent.
The physical locations of the wiring connections necessary to implement a communications network
comprised of the XPC Gateway and AERCO boilers and/or water heaters and a third party BAS or EMS
are provided in the following subsections. Where applicable, connector pinout information is provided for
all AERCO equipment. Refer to the AERCO XPC Gateway Integration Guide (Part II of this manual) for
connection of BAS/EMS equipment used with the XPC Gateway. Also, refer to the BAS/EMS
manufacturer’s equipment manual.
2.3 C-MORE BOILERS OR HEATERS CONTROLLED BY BAS VIA THE GATEWAY
As mentioned in Section 1, C-More Controllers can communicate directly with a BAS utilizing Modbus
RTU protocol via a RS485 network. However, if the BAS does not support Modbus, the XPC Gateway is
required to provide the necessary protocol translation.
All Modbus networks are implemented utilizing a Master-Slave technique where only one device, the
Master, can initiate a communication sequence. AERCO C-More Controllers can only function as Slave
devices on a Modbus network