Emerson P/N 400361-00 manual Communications Protocol, Connecting the PC to the SM-EZMotion Module

4Communications

4.1Communications Protocol

PowerTools Pro communicates with the SM-EZMotion module using 32-bit Modbus RTU protocol.

4.2Connecting the PC to the SM-EZMotion Module

The SM-EZMotion communicates with the PC through the Unidrive SP's communications port. An RS-232 to RS-485 converter is necessary to communicate with the Unidrive SP. The Unidrive SP has an RJ45 serial port connector on the front of the drive.

Control Techniques offers a pre-made cable for this purpose called the “CT Comms Cable" (previously named SE71). Figure 21 below shows the CT Comms Cable.

Figure 21: CT Comms Cable

The RJ45 connector is located under a small rubber flap on the front of the Unidrive SP just below the keypad. The pin-out for this connector is described in the table below.

Pin	Function
1	Termination Resistor
2	RX TX
3	0V
4	+24V
5	Not Used
6	TX Enable
7	RX\ TX\
8	Linked to Pin 7

4.3Configuring Communications in PowerTools Pro

Before attempting to upload or download a configuration using PowerTools Pro, the software must be configured to the correct communications settings. To configure communications, open PowerTools Pro then click on

Options > Preferences > Communications on the Menu Bar. Figure 22 shows the Modbus Setup window that allows the user to configure the communication settings.

Figure 22: Modbus Setup

In the Modbus Setup window, the user can configure the maximum node address they wish to poll for when uploading devices or Flash Upgrading devices. PowerTools Pro will not check to see if any devices with node addresses higher than the number entered are available on the network.

To change the COM port number and Baud Rate, the user must click the Configure Serial Port control button. Figure 23 shows the Communications Setup window.

Figure 23: Communications Setup

Once the COM port and Baud Rate are selected, click OK.

When SM-EZMotion modules are shipped from the factory, they are configured to communicate at a baud rate of 19200 baud.

4.4Uploading and Downloading using PowerTools Pro

Figure 24 below will be used throughout the Uploading and Downloading section of the manual to describe certain processes.

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