2.2.7 Connecting the RS-485 SCADA Serial Port
This port can be used only for connecting a SCADA or any other unit using Modbus protocol to
the SLC-220 for setup, calibration and status interrogation. The specifics of using the protocol with
SLC-220 are detailed in a separate document.
The port is set to 115,200 Baud as default, 8 data bits, 1 stop bit, no parity and no flow control.
The baud rate can be changed by the SLC-Manager program through the PC serial port.
Pass the cable through the proper gland in the external wall of the enclosure. Then connect the
wires to the contacts of terminal block TB2 on the Main board as follows:
TB2 Contact Contact Function (SLC-220 side)
1 A (non-inverting input)
2 B (inverting input)
3 Ground / shield of Cable
Note: Operating mode is Half Duplex. Full duplex is not supported.
Note: See also the note in 2.2.9.
Main Board top-left corner:
To Next Page
Loading...
