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The pin out configuration of RJ45 depends on the type of protocol (RS-232 or RS-485) as well as on the SCADAPack controller board being used. Normally, this information can be found under the Serial communication section of the Hardware manual of the corrosponding SCADAPack controller.

The following information is extracted from hardawar manual of SCADAPack 32 controller.

RJ-45 Connector for RS-232

The RS-232 serial ports using a 8-pin female RJ-45 connectors configured as Data Terminal Equipment (DTE). The recommended specification for RS-232 cable length is a maximum of 50 feet or 15.2 meters. Shielded cable must be used and the shield should be connected to chassis ground at one end.

The following diagram shows the pin connections for the RS-232 (RJ-45) port connector.

The following table provides a description of the function of each pin of the RJ-45 connector. In this table a MARK level is a voltage of +3V or greater and a SPACE level is a voltage of -3V or less.

Pin Function Description
1 5V (Output) This pin can be connected to the 5V power supply by installing a proper jumper on the SCADAPack controller board.
2 DCD (Input) The DCD led is on for a MARK level.
3 DTR (Output) This pin is normally at a MARK level. This pin is at a SPACE level when DTR is de-asserted.
4 GND This pin is connected to the system ground.
5 RxD (Input) The level is SPACE on standby and MARK for received data. The LED is lit for a MARK level.
6 TxD (Output) The level is SPACE on standby and MARK for transmitted data. The LED is lit for a MARK level.
7 CTS (Input) This level must be a MARK for the communication port to transmit data. When the attached device does not provide this signal, the controller keeps the line at a MARK. When the attached device does provide this signal, it must set CTS to MARK to allow the controller to transmit data.
8 RTS (Output) This pin is a MARK if full-duplex operation is selected for the port. This pin is set to a MARK just before and during transmission of data if half-duplex operation is selected. This pin is set to a SPACE when no data is being transmitted.

RJ-45 connector for RS-485

The differential receive and transmit signals are labeled +/-Rx and +/-Tx respectively. Some RS-485 devices refer to the - side of the signal as A and the + side of the signal as B. The following table provides a description of the function of each pin of the RJ-45 connector. In this table a MARK level is a voltage of +3V or greater and a SPACE level is a voltage of -3V or less.

Pin Function Description
1 5V (Output) This pin can be connected to the 5V power supply by installing a proper jumper on the SCADAPack controller board.
2 -Rx (Input) The DCD led is on for a MARK level.
3 -Tx (Output) This pin is normally at a MARK level. This pin is at a SPACE level when DTR is de-asserted.
4 GND This pin is connected to the system ground.
5 +Rx (Input) The level is SPACE on standby and MARK for received data. The LED is lit for a MARK level.
6 +Tx (Output) The level is SPACE on standby and MARK for transmitted data. The LED is lit for a MARK level.
7 N/C Do not connect this pin for RS-485 operation.
8 N/C Do not connect this pin for RS-485 operation.
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