Serial Communications; Rs-485 Communications - Invertek Drives Eco Optidrive Series User Manual

Par Parameter Name
P0-48 DSP comms fault counter
Displays the number of communication errors detected by the Power Stage processor in messages received from the I/O
processor since the last power up
P0-49 Modbus RTU / BACnet Fault Counter
This parameter is incremented every time an error occurs on the Modbus RTU communication link. This information can be used
for diagnostic purposes.

11.Serial communications

11.1. 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 Intertek's Optibus Protocol and one
for Modbus RTU / BACnet. 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 11.2
11.1.1. RS-485 Communications Electrical Connections
Modbus RTU and BACNet MS/TP connection should be made via the RJ45 connector. The pin assignments are as shown in section 11.1. RS-
485 communications.

Modbus RTU and BACNet MS/TP networks require three conductors for best operation and to eliminate common mode voltages
on the drive terminals:
o
RSR85+
o
RS485-
o
0 Volt Common

Connection should be made using a suitable dual twisted pair, shielded cable, with a wave impedance of 120R.

Use one of the twisted pairs to connect to the RS485+ and RS485- of each drive.

Use one conductor of the remaining pair to connect together all the 0 volt common connection terminals.

The cable shield should be connected to a suitable clean ground point to prevent interference with the screen maintained as close
as possible to the cable terminations.

Do not connect the 0 Volt Common, RS485- or RS485+ to ground at any point.

Network terminating resistor (120R) should be used at the end of the network to reduce noise
www.microlectra.nl
Optidrive Eco User Guide Revision 2.01
Not Used
Not Used
0 Volt Common
Optibus / Remote Keypad / PC Connection -
Optibus / Remote Keypad / PC Connection +
+24 Volt Remote Keypad Power Supply
RS 485- Modbus RTU / BACnet
RS 485+ Modbus RTU / BACnet
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
Units
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