USB RS485/232 Converter

USB RS485/232 Converter



I-7561/I-7561U is a commercial module for transferring serial data via USB. It lets you connect your serial devices to systems that use a USB interface. Connecting the I-7561/I-7561U to a PC, you get one RS-232/422/485 port. The I-7561 contains “Self-Tuner” chip auto-tunes the Baud Rate and data format to the RS-485 network. The I-7561/7561U module derives its power from the USB port and doesn’t need any power adapter.


  • Entirely Compliant with the USB 1.1/2.0/3.0
  • DIN-Rail Mounting
  • Automatic RS-485 Direction Control
  • Transmission speed up to 921.6 kbps (For I-7561U)
  • 3000 VDC Isolation Protection on the RS-232/422/485 side
  • No external power supply required
  • ESD Protection for the RS-232/422/485 Data line


I-7561 Driver Windows 98/ME/2000/XP/Vista(32/64-bit)/7(32/64-bit)/Linux
I-7561U Driver Windows 98/ME/2000/XP/Vista(32/64-bit)/7(32/64-bit)/8(32/64-bit)Linux


Models I-7561 I-7561U
USB Fully compliant with the USB 1.1/2.0/3.0
Serial Interface RS-232 The RS-232,RS-422 and RS-485 cannot be used simultaneously.

§  TxD,RxD,GND

§  TxD+,TxD-,RxD+,RxD-

§  Data+,Data-

RS-422/485 Transmission Distance Max 1200 m at 9.6 kbps; Max 400m at 115.2 kbps

(Belden 9841 2P twisted-pair cable, if different cables are used, the transmission distance may change)

Self-Tuner Asic Inside (RS-485) Yes
Speed 300 ~ 115200 bps 300 ~ 921.6 kbps
Connector RS-232/422/485 Removable 10-Pin Terminal Block
USB Type B
Cable Included CA-USB18 (1.8 m Cable) x 1
LED Indicators
Power Yes
Input Voltage Range +5 VDC from USB
Power Consumption 0.5W
Casing Plastic
Flammability Fire-Retardant Materials (UL94-V0 Level)
Dimensions (WxHxD) 72 mm x 115 mm x 35 mm
Installation DIN-Rail Mounting
Operating Temperature -25 oC ~ + 75 oC
Storage Temperature -30 oC ~ + 75 oC
Humidity 10 ~ 90% RH, non-condensing

Dimensions (mm)

Pin Assignments

Terminal No. Pin Assignment
RS-485 01 DATA+
02 DATA-
RS-422/485 03 TxD+
04 TxD-
05 RxD+/DATA2+
06 RxD-/DATA2-
RS-232 07 TxD
08 RxD
09 (B)GND
10 (B)GND