Technical Description
Sealevel Systems
8.Ultra
Page
7
Technical Description
The Sealevel Systems
4.Ultra
provides a PCI interface adapter with 8 RS-232/422/485 asynchronous
serial ports for industrial automation and control applications.
Connector Pin Assignments
RS-422/485 (DB 9 Male)
Signal Name
Pin
#
Mode
GND Ground
5
TX +
Transmit Data Positive
4
Output
TX-
Transmit Data Negative
3
Output
RTS+
Request To Send Positive
6
Output
RTS-
Request To Send Negative
7
Output
RX+
Receive Data Positive
1
Input
RX-
Receive Data Negative
2
Input
CTS+
Clear To Send Positive
9
Input
CTS-
Clear To Send Negative
8
Input
RS-232 (DB-9 Male)
Signal Name
Pin
#
Mode
GND Ground
5
TD Transmit
Data
3
Output
RTS
Request To Send
7
Output
DTR
Data Terminal Ready
4
Output
RD Receive
Data
2
Input
CTS
Clear To Send
8
Input
DSR
Data Set Ready
6
Input
DCD
Data Carrier Detect
1
Input
RI Ring
Indicator
9
Input
Technical Note: Please terminate any control signals that are not going to be used. The most common way to do this
is connect RTS to CTS and RI. Also, connect DCD to DTR and DSR. Terminating these pins, if not used, will help
ensure you get the best performance from your adapter.
