Control Microsystems SCADAPack 32 - Figure 10: Front View of an RJ-45 Connector for RS-232

RJ-45 Modular Jack
1. +5V
2. DCD
3. DTR
4. GND
5. RxD
6. TxD
7. CTS
8. RTS
2
1
8
7
6
5
4
3
Figure 10: Front View of an RJ-45 Connector for RS-232
NOTES:
• +5V is only available on Pin 1 when a jumper is installed on J4.
• Serial port COM1 may be configured as RS-232 or RS-485. A jumper must be installed on J10
to operate COM1 in RS-232 mode. Refer to the Figure 1 for the location of J4 and J10.
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 jumper at J4 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.
SCADAPack 32 Controller Hardware Manual
May 24, 2006
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