USB to Serial Converters Manual
Version 2.0
Document Reference No.: CP_000032 Clearance No.: CP#022
Copyright © Connective Peripherals Pte Ltd
38
6.3
RS-485
Signal Pin-
out
(Half
Duplex)
DB-9 Male connector
The table below shows the RS-485 (half duplex) pinout of the DB-9 male connector.
Pin Number
Pin Type
Description
1
Out / In
Data
–
= Transmit / Receive Data, negative polarity
2
Out / In
Data+ = Transmit / Receive Data, positive polarity
5
Ground
GND = Signal ground
Shield
Case Ground Drain = typically connected to the host PC case
Table 17 - RS-485 Half-Duplex Pin-out for DB-9 Connector
Note:
Other pins have no function in this mode and should be left un-connected.
5-way Terminal Block
The table below shows the RS-485 (half duplex) pinout of the 5 way terminal block (only available on some
models).
Pin Number
Pin Type
Description
1
Out / In
Data
–
= Transmit / Receive Data, negative polarity
2
Out / In
Data+ = Transmit / Receive Data, positive polarity
5
Ground
GND = Signal ground
Table 18 - RS-485 Half-Duplex Pin-Out for 5-way Terminal Block
Note:
Other terminals have no function in this mode and should be left un-connected.
6-way Terminal Block
The table below shows the RS-485 (half duplex) pinout of the 6 way terminal block (only available on some
models).
Pin Number
Pin Type
Description
1
Out / In
Data
–
= Transmit / Receive Data, negative polarity
