9.3 DE-9P Connector for RS-232
RS-232 ports are 9-pin male D-sub-miniature (DE-9P) connectors configured as Data Terminal
Equipment (DTE). A maximum cable length of 50ft (15.2m) is allowed. Figure 11: RS-232 Port
Connector shows the pin connections on the RS-232 connectors.
1.
DCD
2.
RxD
3.
TxD
4.
DTR
5.
GND
6.
nc
7.
RTS
8.
CTS
9.
+5V
7869
1 2 3 4 5
Figure 11: RS-232 Port Connector
Pin Type Description
Pin 1
DCD
input The DCD led is on for a MARK level. (> +3V)
Pin 2
RxD
input The level is SPACE (< -3V) on standby and MARK for
received data.
The RxD LED is lit for a MARK level.
Pin 3
TxD
output The level is SPACE on standby and MARK for transmitted
data.
The LED is lit for a MARK level.
Pin 4
DTR
output This pin is normally at a MARK level.
This pin is at a SPACE level when DTR is de-asserted.
Pin 5
Ground
This pin is connected to the system ground.
Pin 6 This pin is not connected.
Pin 7
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.
The LED is ON for a MARK level.
Pin 8
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.
The LED is on for a MARK level.
Pin 9 output This pin is connected to the 5V power supply. Exercise
caution when using it.
This pin must NOT be connected if it is not used.
SCADAPack 32 Controller Hardware Manual
May 24, 2006
28
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