Manual-FTDR-Rev1311.pdf
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DATA: RS232/RS422/2 wires RS485/4 wires RS485 compatible
Terminal pins assignment:
DIP1 Switch setup table:
DIP Switch pin name
RS-232
RS-422
4wire
RS-485
2wire
RS-485
D1( RS422/4 wires RS485 input terminator
120Ω)
OFF
ON/OFF
②
ON/OFF
②
OFF
D2( 2 wires RS485, RS422/4 wires RS485
output
terminator 120Ω)
OFF
ON/OFF
②
ON/OFF
②
ON/OFF
②
D3( 2 wires RS485/4 wires RS485 output
Pull-up/Pull-down resistance
OFF
OFF
ON/OFF
①
ON/OFF
①
D4( RS232/RS422/2 wires RS485/4 wires
RS485 select
OFF
OFF
ON
ON
D5( RS232/RS422/2 wires RS485/4 wires
RS485 select
ON
OFF
OFF
ON
①
The 2 wires RS485/4 wires RS485 output bus pull-up and pull-down resistance usually should be
switched on. But if there are several fiber transmitters or receivers, 2 wires RS485/4 wires RS485
output interfaces are connected together, only one of the 2 wires RS485/4 wires RS485 output Pull-up
and Pull-down resistance should be switched on, the others should be switched off.
②
The terminators can be switched on or off according to the RS485 bus connection. When the fiber
transmitter or receiver is placed at the end point of bus, the terminators are usually switched on, but
Pin Name
Data
1
2
3
4
RS232
TXD
Data transmit signal;
input
RXD
Data
receive
signal;
output
GND
GND of RS232 data
NC
（
not connected
）
RS422
TXD+
D
ata transmit signal “+”,
input
TXD-
D
ata transmit signal “−”,
input
RXD+
Data receive
signal “+”,
output
RXD-
Data receive
signal “−”,
output
4 wires
RS485
485 TX+
D
ata transmit signal “+”,
input
485TX-
D
ata transmit signal “−”,
input
485RX+
Data receive
signal “+”,
output
485RX-
Data receive
signal “−”,
output
2 wires
RS485
NC
（
not connected
）
NC
（
not connected
）
485+
Data sig
nal “+”
485-
D
ata signal “−”
Summary of Contents for FTDR-S2-WSB
Page 1: ...FTDR S2 WSB User Manual ...
