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© Sealevel Systems, Inc.
R5120 & R5140 Manual | SL9212 10/2021
Technical Description, Continued
Connector Pin Outs
COM1 Serial Port (RS-232/422/485)
COM1 is configured at the factory for RS-232 and is available on a DB9 male connector. To configure the electrical
interface for RS-422/485, refer to the jumper configuration section of this manual or contact your sales rep to
have this configured at the factory.
COM1 is labeled as “|O|O|” with one small dot to the right.
The pin out for the DB9 serial port is shown in the table
below:
PIN#
RS-232
RS-422
RS-485
1
DCD
TX-
DATA -
2
RX
TX+
DATA +
3
TX
RX+
--
4
DTR
RX-
--
5
GND
GND
GND
6
DSR
-
-
--
7
RTS
--
--
8
CTS
--
--
9
RI
--
--
COM2, 3, 4 Serial Ports (RS-232)
COM2, 3, 4 support RS-232 and are available on DB9 male connectors.
The COM ports are labeled as a |O|O| with two, three, or four dots to the right of this symbol. The RS-232 pin out
is shown in the table below:
PIN#
RS-232
1
DCD
2
RX
3
TX
4
DTR
5
GND
6
DSR
7
RTS
8
CTS
9
RI