9440300990 22-5
DECS-250 Communication
Figure 22-6. Remote Module Setup
Ethernet Communication
Depending upon the style number, each DECS-250 is equipped with a copper (100Base-T) Ethernet
communication port (style xxxxx1x) or a fiber optic (100Base-FX) Ethernet communication port (style
xxxxx2x). The ST type fiber optic port uses a 1300 nanometer, near-infrared (NIR) light wavelength
transmitted via two strands of multimode optical fiber, one for receive (RX) and the other for transmit (TX).
The copper or fiber optic Ethernet connector is located on the right side panel. DECS-250 metering,
annunciation, and control is provided through the Ethernet port using the Modbus TCP protocol. DECS-
250 Modbus communication registers are listed and defined in the Modbus Communication chapter of
this manual.
Industrial Ethernet devices designed to comply with IEC 61000-4
series of specifications are recommended.
Ethernet Connection
1. Connect the DECS-250 to the PC using a standard Ethernet cable.
2. In BESTCOMSPlus, click Communication, New Connection, DECS-250, or click the Connection
button on the lower menu bar. The DECS-250 Connection window appears. (Figure 22-7)
3. If you know the IP address of the DECS-250, click the radio button for the Ethernet Connection IP
at the top of the DECS-250 Connection window, enter the address into the fields and click the
Connect button.
4. If you don’t know the IP address, you can perform a scan (Figure 22-8) to search for all
connected devices by clicking the Ethernet button in the Device Discovery box. After the scan is
complete, a window containing the connected devices will be displayed. (Figure 22-9)
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