76 PACMotion VFD AC Variable Speed Drive User Guide GFK-3111A
Serial Communications
RS-485 Communications
PACMotion VFD 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 Emerson’s communication Protocol and one for Modbus RTU / CANBus. Both
connections can be used simultaneously. The communication connection is always available, and can be used
simultaneously with other interfaces, however only one other interface may be used, e.g. If Modbus RTU is in
use, CAN is disabled. If a Fieldbus Option Module (E.g. PROFINET) is inserted into the drive, both Modbus and
CAN are disabled. The electrical signal arrangement of the RJ45 connector is shown as follows:
Figure 30: RS-485 Communications
1 CAN-
2 CAN+
3 0 Volts
4
Communication / Remote Keypad / PC Connection
5
Communication
/ Remote Keypad / PC Connection +
6 +24 Volt
7 -RS485 (Modbus RTU)
8 +RS485 (Modbus RTU)
Warning:
This is not an Ethernet connection. Do not connect
directly to an Ethernet port.
Warning:
When using Modbus RTU or CANopen, ensure that
the 0 V signal (T3) is also used to avoid comms errors
and potentially damaging common mode voltages.
• The communication data link is only used for connection of Emerson peripherals and inter-drive
communication.
• The Modbus interface allows connection to a Modbus RTU network as described in section Modbus RTU
Communications on page 78.
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