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  • SUNIX - STD-1918H-SI



SUNIX STD-191H-SI advanced media converter provides serial interface exchange between RS-232 to RS-422/485 and vice-versa. RS-232 hardware is a popular used and easy design interface in today's industrial environment and commercial application. However the drawback of RS-232 is the point to point characteristic and a distance limitation of 15 meters, SUNIX converter provides an ideal solution for extending RS-232 transmission distance and increasing networking capability. Users can use RS-232 devices to connect to an industrial RS-422 or RS-485 network and increase transmit data up to 1.2 kilometer by using a differential signal and multi-drop connections.


  • Industrial grade design for stability and reliability
  • 12V DC Jack & External power 12~48V DC terminal block with reverse polarity protection
  • Embedded ESD surge protection built-in
  • Optical isolation provides protection against damage from static electrical charge
  • Power surge protection provides protection against surge damage from high energy spike
  • Auto Tune feature provides automatic setup of communication protocol
  • RS-422/485 Auto Detect and Switch technology enable serial device plug-n-play without jumper or switch setting
  • RS-485 AHDC/CS technology allows accurate switching of the transmitter on and off for precise timing of the data transmission
  • RS-232 to RS-422/485 converter with RTS+/- CTS+/- support
  • RS-422/485 Handshaking Communication provides hardware flow control for best prevention of data error or data lost
  • Plug-in screw terminal block for easy RS-422/485 wiring
  • Detachable wall and DIN-rail mounting kit design
  • Plug-n-play & compact size designed


Description RS-232 to 422/485 Media Converter with Surge & Isolation
Communication -
Port1 RS-232(DB9) Female
Port2 RS-422/485 (9-pin Terminal Block)
Distance 1.2km (RS-422/485)
Baud Rate 50 bps up to 460.8 Kbps
RS-232 Signals TxD, RxD, RTS, CTS, GND
RS-422/485 Signals RS-422 : TxD+, TxD-, RxD+, RxD-, RTS+, RTS-, CTS+, CTS-, GND
4 Wire RS-485 : TxD+, TxD-, RxD+, RxD-, RTS+, RTS-, CTS+, CTS-, GND
2 Wire RS-485 : Data+, Data-, GND
Power -
Redundancy Dual
Connectors 3-pin Removable Terminal Block + DC Jack
Consumption 1A@ 12VDC
Input 12V~48VDC(24VDC)
Protection -
Isolation 2.5KV
Surge 400W for RS-422/485 meets IEC6001-4-5
Reverse Power Present
Mechanical -
Dimension 30 x 68.5 x 105 mm (D x Wx H)
Casing Aluminium (IP30)
Environment -
Operating Temperature Standard 0 ~ 60°C / Extend -40 ~ 80°C
Operating Humidity 5% to 95% RH
Storage Temperature -40 ~ 85°C
Certifications -
EMC FCC Part 15, CISPR (EN55022) Class A, CE
Safety UL60950, CAN/CSA-C22.2 No.60950
Shock / Vibration IEC60068-2-27, IEC60068-2-32 / IEC60068-2-6
Warranty 5 years

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