PRODUCT
USB ⇔ RS-422/485
Interface Converter

SI-35USB
SI-35USB-2

●3000 High-voltage Resistant Isolation type
●SI-35USB-2 is smaller than SI-35USB by 20% and supports the demand for space-saving.
●USB Bus power. No need to have an external power supply.
●Virtual COM port driver supporting WindowsR 10 is attached.
●Card-case sized, metal enclosure, noise resitance.
●Able to mount on 35mm DIN rail.
●Lowe power consumption.
●Support 300bps up to 3Mbps.
●Support RS-485 driver control automatically and DTR/RTS line control.
●Monitor RS-485 line and support flow control on CTS line.
●Able to control 128sets maximum as RS-485 multi-drop type.
●Able to extend RS-422/485 up to 1.2Km.

Data Sheet
Specifications (Interface Converter SI-35USB)
Conversion USB⇔RS-422/485
USB Interface USB1.1/2.0, full speed transmission B connector
LED Transmission: TXD, Reception: RXD, Power: PWR
Serial Interface RS-422/485, Full duplex/ Half duplex
5 pole terminal block (press-to-screw pitch type)
Fitness wire: AWG24-14*1
Serial Signal TXD, RXD or TXD/RXD
Asynch type Asynch
Baud Rate 300bps to 3Mbps*2
Data Frame Data bits[7or8] + Parity[Even/Odd/none] + Stop bits[1/2]
Flow Control Xon/off, RTS/CTS (supported by COM port emulator)
RS-485 Monitor Monitor non-communication on RS-485*3
RS-485 Driver Control Control RS-485 driver to be active. (for transmission only)*4
Multi-drop connection Max. 128 sets
Mounting method Using M3 screw hole in the bottom face, installation to a DIN rail (SI-DIN70 is required.), wall hanging by SI-WM1(option), installation to metal wall by magnets SI-MG70(option)
Signal Isolation Protection 3000Vdc
System requirements
(USB equipment)
PC: PC/AT compatible with USB port (DOS/V PC)
OS: Windows® 7/8/8.1/10*5
Power USB Bus power, DC5V±10%, Max. 150mA
Power Consumption SI-35USB: 1.3W or less
SI-35USB-2: 0.5W or less
Temperature SI-35USB: In operation: -10 to 55°C, In storage: -20 to 75°C
SI-35USB-2: In operation: -20 to 60°C, In storage: -20 to 75°C
Humidity In operation: 10 to 90%RH, In storage: 10 to 90%RH (No condensation)
Standard For SI-35USB-2: CE(class A), EMC(EN61326-1:2013)
Dimension SI-35USB: 65(W)×90(D)×22(H)mm
SI-35USB-2: 58(W)×80(D)×22.5(H)mm
Weight SI-35USB: Approx. 200g
SI-35USB-2: Approx. 160g
Composition USB cable (1.8m), Utility CD, Instruction manual (in Japanese only), Warranty.
*1: Single wire: 0.2-2.5 mm2. Stranded wire: 0.2-1.5 mm2.
*2: Speed is established in application software. Certain speed beyond 1.2Mbps cannot be established.
*3: Half duplex RS-485 communication requires data transmission while none of other equipments transmit data on RS-485. SI-35USB-2 monitor function sends signal to CTS of the virtual COM port, when designated non-communication period was detected. By this, communication control precession in the PC side is simplified.
*4: Half duplex RS-485 communication needs to activate RS-485 driver only to transmit data. SI-35USB-2 driver auto-control activates the driver IC on the top of transmitted data, and makes it to be non-active after the last data automatically.
*5: Supports 32bit/64bit of Windows 7/8/8.1/10