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5
Communications
5.1
Communications Protocol
PowerTools Pro communicates with the SM-EZMotion module using 32-bit Modbus RTU or Ethernet protocol.
5.2
Connecting the PC to the SM-EZMotion Module
5.2.1
Modbus
EZMotion communicates with the PC through the drive's RS-485 communication port. An RS-232 to RS-485 converter is
necessary to communicate with the drive. The Unidrive SP/Digitax ST has a RJ45 serial port connector on the front of the
drive.
Control Techniques offers a pre-made cable for this purpose called "CT Comms Cable" (previously named SE71). Figure 23
shows the CT Comms Cable.
Figure 23:
The RJ45 connector is located under a small rubber flap on the front of the Unidrive SP just below the keypad and is located
below the keypad on the front of the Digitax ST. The pin-out for this connector is the same for both Unidrive SP/Digitax ST and
is described in the table below.
5.2.2
Ethernet
Ethernet communication is only possible when a SM-Ethernet module is in one of the Unidrive SP/Digitax ST slots. The SM-
Ethernet module communicates to the PC using a standard RJ45 connection to a 10 Mbps/100 Mbps Ethernet system. For
more information on the SM-Ethernet module see the SM-Ethernet User Guide.
5.3
Configuring Communications in PowerTools Pro
When attempting to upload or download a configuration using PowerTools Pro, the software may need to be configured to the
correct communication settings for the intended connection.
To configure the preferences, select Options > Preferences > Ptools Operation from the menu bar. Figure 24 shows the
Preferences window.
5.3.1
Communications Tab
This tab allows the user to select what communication connections are scanned when performing any communication
operations. Default is all ports are scanned.
The serial communication baud rate can be changed, the drive baud rate and PowerTools Pro baud rate must match. When
the Unidrive SP/Digitax STs are shipped from the factory, they are configured to communicate at a baud rate of 19200 baud.
EZMotion User/Programming Guide
Revision A8
CT Comms Cable
Pin
1
2
3
4
5
6
7
8
www.controltechniques.com
Function
Termination Resistor
RX TX
0 V
+24 V
Not Used
TX Enable
RX\ TX\
Linked to Pin 7
25
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