Connective Peripherals ES-U Series - RS-485 Signal Pin-Out (Half Duplex); Table 17 - RS-485 Half-Duplex Pin-Out for DB-9 Connector; Table 18 - RS-485 Half-Duplex Pin-Out for 5-Way Terminal Block

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