Serial Device Server - RS232/RS485 to Ethernet converter
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3. Hardware Description
3.1 LED status
There is two leds in RJ45 connector, one is green, and the other is yellow. And 1 power led.
LED name
description
red
Power
Light When Power on
green
Link state
Light when 100Mbps network linked
yellow
Data transfer
Blink when there is data in or out
3.2 Interface Description
RS232 interface
：
RS232 use 9 pin female (hole), only 3 pins in use, others are NC, the detail is below.
ID Mark
Description
2
TXD
RS232 Send of module
3
RXD
RS232 Receive of module
5 GND
Ground
We can offer two kinds of serial lines, if needed, please choose to buy:
1. Male to Female direct serial cable: connect serial server and the computer directly to debugging and Testing.
2. Male to Male and Cross Pin2 and Pin3 serial cable: used to connect RS232 serial port server and general user
equipment.
RS485 interface:
RS485 has two lines A (data+) and B (data-), 120 Ohms Termination Resistance on board.
Notice:
this module use Jumpers to change work for RS232 or RS485, by default it work at RS232 mode, if you
need to use RS485, please open the box and change the jumpers.
Jinan USR Technology Co., Ltd. Page 8 of 13
