© Sealevel Systems, Inc.
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SeaLINK User Manual
Connector Pin Assignments
Connector Pin Assignments - DB9
The following pin out diagrams cover all Ethernet serial servers with a DB9
connector, excluding the 4103, which is covered on the following page.
RS-232 (DB9 Male)
This pin out covers the following products:
4101, 4104, 4201, 4203, 4401, 4403, 4801, and 4803
Pin # Signal Name
Mode
1 DCD
Data
Carrier
Detect Input
2 RX
Receive
Data
Input
3 TX
Transmit
Data
Output
4
DTR
Data Terminal Ready
Output
5 GND
Ground
6
DSR
Data Set Ready
Input
7
RTS
Request To Send
Output
8
CTS
Clear To Send
Input
9 RI
Ring
Indicator
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.
RS-422/485 (DB9 Male)
This pin out covers the following products:
4102, 4104, 4202, 4203, 4402, 4403, and 4803
Pin # Signal Name
Mode
1 RX+
Receive
Data
Positive
Input
2 RX-
Receive
Data
Negative Input
3
TX-
Transmit Data Negative
Output
4
TX+
Transmit Data Positive
Output
5 GND
Ground
6
RTS+ Request To Send Positive
Output
7
RTS-
Request To Send Negative
Output
8
CTS-
Clear To Send Negative
Input
9
CTS+ Clear To Send Positive
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 (connect positive to positive and negative to negative).
Terminating these pins, if not used, will help ensure you get the best performance from your adapter.
