Serial Communications; Rs-485 Communications - Invertek Optidrive Eco ODV-3-220043-1F12-TN User Manual

10. Serial Communications

10.1. RS-485 Communications

Optidrive Eco has an RJ45 connector located within the wiring enclosure of the drive. This connector allows the user to set up a drive
network via a wired connection. The connector contains two independent RS485 connections, one for Invertek's Optibus Protocol
and one for Modbus RTU / BACnet MSTP. Both connections can be used simultaneously.
The electrical signal arrangement of the RJ45 connector is shown as follows:
 The Optibus data link is only used for connection of Invertek peripherals and inter-drive communication.
 The Modbus interface allows connection to a Modbus RTU network as described in section 10.2. Modbus RTU Communications.
10.1.1. RS-485 Communications Electrical Connections
Connection to the
drive through the
option
OPT-2-BNTSP-IN
OPT-2-BNTSP-IN
OPT-2-BNTSP-IN
Modbus RTU/BACnet
RS485 Controller
RS485+
RS485-
0 Volt / Common
Ground
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Direct connection to the drive
through the built-in RJ45 port
RJ45 connector pinout
1 2 3
Pin 3 – 0 Volt / Common
Pin 7 – RS485- (Modbus RTU)
Pin 8 – RS485+ (Modbus RTU)
1
Not used
2
Not used
3
0 Volts
4
-RS485 (PC)
5
+RS485 (PC)
6
+24 Volt
7
RS 485- Modbus RTU / BACnet MSTP
8
RS 485+ Modbus RTU / BACnet MSTP
Warning:
This is not an Ethernet connection. Do not connect
directly to an Ethernet port.
Warning:
When using Modbus RTU or BACnet, ensure that the
0V signal (T3) is also used to avoid comms errors
and potentially damaging common mode voltages.
NOTES
• Use 3 or 4 Conductor Twisted Pair Cable
• RS485+ and RS485- must be twisted pair
• Ensure the network taps for the drive
are kept as short as possible
• Using Option OPT-2-BNTSP-IN is
preferred
1 2 3 4 5 6 7 8
• Terminate the network cable shield at
the controller only. Do not terminate at
1 2 3 4
5 6 7 8
the drive!
• 0 Volt common must be connected
across all devices and to reference 0 Volt
terminal at the controller
• Do not connect the 0V Common of the
network to power ground
RS485+
RS485-
0 Volt / Common
Shield
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