LAN ⇔ RS-422/485
Interface Converter


●Connects 10Base-T/100Base-TX by auto-detection.
●Supports multi protocols such as TCP/IP, UDP/IP, ARP, etc.
●Automatically controls RS-485 communications, which is available to use the flow control of XPort®.
●Able to control 128sets maximum in RS-485 multi-drop type.
●Non-use of Electrolytic capacitor and tantalum capacitor.
●Can use in the workplace environments between -25 to 75 degree Celsius.
●Low power consumption. Supports DC5 to 30V wide input.
●Solid, card-case sized, and metal enclosure.
●Supports installation of 35mm DIN rail.
●Environment-friendly design. Use lead-free solder. Non-use of chromium screw etc.

SI-65A: Japanese model (100V Input AC adapter)
SI-65A-E: World wide model (Wide Input AC adapter )

SI-65A is an interface converter to connect factory automation equipment and analyzers, which only have the serial communication ports for RS-422/485, to LAN.
The built-in Lantronix Xport® on the LAN interface converts RS-422/RS-485 data into LAN protocol (TCP/IP). It also transfers LAN data, controlling RS-485 driver automatically. SI-65A supports a wide range of temperature (-25 to 75°C) and power supply input (DC5 to 30V) compared to SI-65. It has the robust metal body and supports 35mm DIN rail.Therefore, you can use it for factory automation without worry.

■Block Chart

The images are CAD data image.

■Interface Description

RS-422/485 terminal

6 terminals terminal block, easy to use for wiring at the site

Number Name Full duplex*1 Half duplex*1
I/O direction*2 Description I/O direction*2 Description
1 SD+ Out Send data+ - Cannot used*3
2 SD- Out Send data- - Cannot used*3
3 SD/RD+ In Receive data+ I/O Send/Receive data+
4 SD/RD- In Receive data- I/O Send/Receive data-
5 GND - Signal ground - Signal ground
6 +5V IN - External power input   External power input
*1: Can be switched by the dip switch B.
*2: "Out" means when signal outputted from the converter and "In" means when signal is inputted. Both direction is "I/O".
*3: Do not connect anything when in half duplex mode.


LED Description
SD Lights when data comes from LAN to RS-422/485.
SD/RD Lights when data goes RS-422/485 to LAN.
DRIVER ACTIVE Lights when the RS-485 driver of the converter is active.
PWR Lights in green when powered.


Dip switch SW-A

Can set RS-422/485 driver control method and value of internal timer for the line monitoring.

SW1 SW2 SW3 Internal timer
OFF OFF OFF 57 More300
ON OFF OFF 14.3 More1200
OFF ON OFF 7.1 More2400
ON ON OFF 3.6 More4800
OFF OFF ON 1.8 More9600
ON OFF ON 0.9 More19200
OFF ON ON 0.45 More38400
ON ON ON 0.11 More115.2K
SW4 OFF Sets the driver in active by the status of common IO pin CP2 of the XPort (for RS-422).
ON Automatically sets the driver active when transmitting RS-422/485 signals (for RS-485).


Dip switch SW-B

Can select the communciation method of RS-422/485 and terminal resistor.

SW Function OFF ON
SW1 Method RS-422 (full duplex) RS-485 (hull duplex)
SW2 Receives the echo of transmitted data. Yes No
SW3 Terminal resistor between SD+ and SD- Open 100Ω
SW4 erminal resistor between SD/RD+ and SD/RD- Open 100Ω

■Connection example

In addition to the installation and screwing using the M3 screw holes on the bottom, you can use the optional DIN mounting plate (SI-DIN70) or DIN vertical mounting plate (SI-DIN30S) to mount to a 35mm DIN rail. You can also mount the by using the wall mounting bracket (SI -WM1) with screwing from the front.

< DIN Rail Installation Example >

< Optional "Metal Fitting for Wall" >

■A Useful Tool for Multiple Operation

SILANIOinit is a configuration tool for LINEEYE products embedded WiPort-NR. It is useful and saves time to rewrite the WiPort-NR configuration file (Setup Record) .

[ Functions ]
  • Searches the device on the Network. Displays the MAC address.
  • Reads and saves the configuration (set-up record) of converter.
  • Writes to the set-up record of selected converter.
  • Sets the IP address of selected converter.
< Configuration tool (SILANIOinit) >