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mFi™ User Guide
Appendix K: Pinouts
Appendix K: Pinouts
The table below lists the pinouts for RS232, RS422, and
RS485.
mPort-S Serial DB9
Function
Pins 2, 3, 5, 6, and 9 are used for serial DB9 communication
and grounding.
RXD-
TXD- Ground
RX
TX
R+
T-
Ground
Pinout
R-
T+
RS232
✓
RS422
✓
✓
✓
✓
*
RS485
✓
✓
✓
✓
*
✓
G
✓
Note: RX-/TX- and RX+/TX+ can be jumpered
for 2-wire RS485 networks.
SERIAL DB9
RXD+
TXD+
Pin
1
2
3
4
5
Function
-
RXD-
TXD-
-
Gnd
Pin
6
7
8
9
Function
RXD+
-
-
TXD+
mPort-S Terminal Block
The Terminal Block port is labeled for RS485 pinout.
RS232
R+ and T+ are not used with RS232 connections.
R- R+ T- T+ G
RX
TX
Ground
RS422/RS485
R- R+ T- T+ G
RX-
RX+
TX-
Ubiquiti Networks, Inc.
TX+
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