© Sealevel Systems, Inc.
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SeaLINK User Manual
Connector Pin Assignments - 4103
RS-232 (DB9 Male)
This pin out covers the 4103 only.
Pin # Signal Name
Mode
2 RX
Receive
Data
Input
3 TX
Transmit
Data
Output
5 GND
Ground
7
RTS
Request To Send
Output
8
CTS
Clear To Send
Input
RS-422/485 (DB9 Male)
This pin out covers the 4103 only.
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.
Relay / Input Connections
This pin out covers the removable terminal block on the 4103 only. Refer to the 4103
Digital I/O section for information on using the input and relay.
Pin #
Signal
Name
1
V+
9-30 VDC Input
2
V-
Supply Power Ground
3
Relay 2
Relay Contact 2
4
Relay 1
Relay Contact 1
5
Input 2
Optically Isolated Input
6
Input 1 Optically Isolated Input
