2.2.9 Connecting a PC to RS-232 Serial Port
A PC can be connected to the SLC-220 for setup, calibration and monitoring the sensors when
required. The PC should have the SLC-Manager program installed to do this.
A RS-232 cable is supplied: Male to female, non-crossed Rx & Tx. Connect the 9-pin male D-
Subminiature connector to connector J9 on the Main board, as follows:
J9 Contact Contact Function (SLC-220 side)
2 RxD (Data input to SLC-220)
3 TxD (Data output from SLC)
4 DTR (Input, Data Terminal Ready from PC)
5 GND (and shield of RS-232 Cable)
Connection of PC DTR to pin 4 is essential to enable automatic detection of a device connected to
this port.
For a PC without a RS-232 connector, a RS-232 to USB adaptor is also supplied.
For IP65 / NEMA 4 enclosure of SLC-200/Multi: Connect the PC to an extension connector
located at the top-left of the opened enclosure, and marked "PC".
For IP65 / NEMA 4 enclosure of SLC-200/Basic: Connect the PC to an extension connector
located at the right of the opened enclosure, and marked "PC".
For Exd / NEMA 7 enclosure: There is a "PC" connector located under the glass window. This
enables easy connection of a PC without the need to open the screws of the enclosure.
The communication through this port is in Modbus protocol with a fixed address 1. Therefore, a
SCADA can be connected to the RS-232 port if required.
The port is set to a fixed 115,200 Baud, 8 data bits, 1 stop bit, no parity, and no flow control.
Note: The PC and the SCADA share the same serial port on the SLC-220 Main board. When a
PC or any other terminal is connected to the RS-232 port, the RS-485 SCADA port is disabled
within 10 seconds after the SCADA confirms this event. This is required since the SLC-220 acts
as a slave device, and can handle only one master device at a time: PC or SCADA.
To Next Page
Loading...
