COPELAND E2E Supervisory Controllers Instruction Manual
- June 17, 2024
- Copeland
Table of Contents
BACnet MSTP Network Wiring for E2 and E3
Supervisory Controllers
Technical Bulletin
Overview
When network wiring BACnet MSTP devices to E2 or E3 supervisory controllers:
if using a COM port with two connectors (A and B), the BACnet devices MUST
ONLY be wired to the COM A connector of E2 or E3. The COM B connectors MUST
NOT be used for BACnet MSTP network wiring.
BACnet MSTP devices wired to a COM port are required to pass messages between
each other as required by the MSTP communication protocol. Copeland
Supervisory controllers provide certain COM ports with two connectors (A and
B), which expand the capacity of devices that can be connected to a single COM
port. Client/Server communication protocols, such as Modbus or IONet, are
supported using this wiring arrangement. However, BACnet MSTP devices do not
use a client/server arrangement and must all be wired on the same physical
network in order to communicate properly. Therefore, a COM port with two
connectors may be configured for BACnet communication, but all BACnet devices
must be wired to the A connector only.
E2E BACnet Wiring
For E2E: use COM 2A, COM 4A, or COM 6.
Use COM A side only. Any COM port can be used, but if there is an A and B port, only use side A and leave side B unused.
E3 BACnet Wiring
For E3: use COM 1A, COM2, COM3, or COM4A.
Use COM A side only. Any COM port can be used, but if there is an A and B port, only use side A and leave side B unused.
Recommendations
To ensure the reliable operation of a BACnet MSTP network when using a supervisory controller with RS485 ports, please follow these recommendations:
-
Select COM ports with single connectors to use with BACnet MSTP networks as a first option. This will allow the COM ports with A and B to be used for IONet or Modbus devices which can properly utilize both connectors.
For E2, COM6 is recommended, and for E3, COM 2 and COM 3 are recommended. -
Group BACnet MSTP Devices on same physical Network cable segment: Connect all devices to a single COM port connector of the Supervisory Controller. For COM ports with two connectors (A and B) use the COM A connector;
the COM B connector MUST be left unused. -
Clearly label the ports of the Supervisory Controller to avoid accidental connections to any unused COM B connector.
-
Use recommended cable:
a. For 9600 or 19200 baud rate, Use Copeland recommended cables Maximum cable distance of 4000ft.Belden 8761 Copeland P/N 035-0002,
Belden 8641 Copeland P/N 135-8641,
General Cable Copeland P/N 135-0600, or
Echelon Level 4 cable may be used.
b. For 38400 baud rate or 57600 baud rate, the General Cable P/N 135-0600 or Echelon Level 4 cable must be used with maximum cable distance of 2000ft for 38400 baud, or 1200ft for 57600 baud. -
Properly Terminate the Network: Termination is essential at both ends of the network cable. Termination can be achieved using termination jumpers on the supervisor setting all three jumpers to the MOD position.
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Observe Proper Network Polarity: Ensure that the polarity of the network cable wires (RS485+, RS485-) is consistent throughout the network: only reverse the polarity at the E2/E3 end of network cable if required. Reversing the polarity at the E2/E3 end of the BACnet MSTP network cable is typical, but check the documentation for each
BACnet device type to verify if it is required. -
Use Daisy-Chain Topology: BACnet MSTP networks are typically configured in a daisy-chain topology, where each device is connected to the previous and the next device. This topology simplifies the network and ensures that the token can circulate efficiently. Avoid T-Branches and Star Topologies.
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Maintain Proper Spacing: Avoid running network cables in close proximity to power cables or other sources of electrical interference, which can introduce noise into the communication lines.
-
Check device manufacturer’s guide for proper power and networking.
-
Test and Commission the Network: After wiring and termination, thoroughly test and commission the BACnet
MSTP network to ensure proper communication and correct addressing of devices. -
Label Network Devices: Label each device and cable segment for easy identification and troubleshooting in case of network issues.
For additional information, contact Technical Services at
833-409-7505 or email
[email protected]
Document Part # 026-4979 Rev 0
This document may be photocopied for personal use.
Visit our website at www.copeland.com for the
latest technical documentation and updates.
For Technical Support call 833-409-7505
or email
[email protected]
The contents of this publication are presented for informational purposes only and they are not to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. Copeland reserves the right to modify the designs or specifications of such products at any time without notice. Responsibility for proper selection, use and maintenance of any product remains solely with the purchaser and end-user. ©2023 Copeland is a trademark of Copeland LP.
Document Part # 026-4979 Rev 0
This document may be photocopied for personal use.
Visit our website at www.copeland.com for the
latest technical documentation and updates.