Document Reference No.: ES_000086
ES-R-2x01B-M RS-232 to RS-422/RS-485 Converters Manual
Version 1.0
Clearance No.: ES
#
42
©2010 - 2011 EasySYNC Ltd.
14
5.5
RS-485 Signal Pin-out (full duplex)
DB-9 Male connector
The table below shows the RS-485 (full duplex) pinout of the DB-9 male connector.
Pin Number Description
1
TxD- = Transmit data, negative polarity
2
TxD+ = Transmit data, positive polarity
3
RxD+ = Receive data, positive polarity
4
RxD– = Receive data, negative polarity
5
GND = Signal ground
Note: Other pins have no function in this mode and should be left un-connected.
Table 10
RS-485 full duplex pin-out for DB-9 connector
5-way Terminal Block
The table below shows the RS-485 (full duplex) pinout of the 5 way terminal block.
Pin Number Description
1
TxD- = Transmit data, negative polarity
2
TxD+ = Transmit data, positive polarity
3
RxD+ = Receive data, positive polarity
4
RxD– = Receive data, negative polarity
5
GND = Signal ground
Table 11
RS-485 full duplex pin-out for terminal block
