9.4 RS-232 Cables
9.4.1 RJ-45 to DE-9S DTE
This cable is used to connect from an RJ-45 based RS-232 port on the SCADAPack 32 controller to
DE-9P connector on a DTE such as a PC. A 10 ft. long cable is available from Control Microsystems
as part number 297217.
RJ-45
8 Pins
SCADAPack 32
DTE Function
DE9S DTE
Function
DE9S
Shield connects to shell
6 TxD RxD 2
5 RxD TxD 3
4 GND GND 5
1, 2, 3, 7 and 8
are not
connected at this
end.
GND GND No wires connected at
this end.
9.4.2 RJ-45 to DE-9P DCE
This cable is used to connect from an RJ-45 based RS-232 port on the SCADAPack 32 controller to
DE-9S connector on a DCE such as a modem. A 15-inch long cable is available from Control
Microsystems as part number 297218.
RJ45 SCADAPack 32
DTE Function
DE-9P DCE
Function
DE
Shield connects to shell
3 DTR DTR 4
6 TxD TxD 3
5 RxD RxD 2
2 DCD DCD 1
4 GND GND 5
7 CTS CTS 8
8 RTS RTS 7
1 +5V +5V 9
9.5 RS-232 Wiring Examples
9.5.1 DTE to DTE without Handshaking
There are several methods for wiring the RS-232 COM port to DTE and DCE (Data
Communications Equipment) devices. The simplest connection requires only 3 wires: RxD, TxD and
signal ground. Figure 12: RS-232 DTE to RS-232 DTE without Handshaking shows a common
RS-232 COM port to DTE device.
SCADAPack 32 Controller Hardware Manual
May 24, 2006
29
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