Waveshare 4Ch Industrial USB TO RS485 Converter Multi Systems Support Multi Protection Circuits - RS8661

Description:

The Waveshare Industrial USB to 4-Channel RS485 Converter is a high-performance communication interface designed for reliable and robust industrial data transmission. Featuring four independent RS-485 channels, this converter supports simultaneous multi-device communication across various systems.

Built with multiple protection circuits—including ESD, surge, and over-voltage protection—it ensures stable operation in harsh environments. The durable aluminum alloy casing enhances heat dissipation and provides long-term durability, while wall-mount and DIN rail-mount support offer flexible installation options. Compatible with major operating systems, it’s ideal for industrial automation, data acquisition, and control systems.

Specification:

PRODUCT TYPE	Industrial Grade USB to RS-485 converter
Host port	USB
Device port	RS485
Baudrate	1200bps ~ 460800bps
USB	Operating voltage	5V
	Connector	USB-B
	Protection	500mA resettable fuse, ESD protection
	Transmission distance	About 5m
RS485	Connector	Screw terminal
	Protection	600W lightningproof and surge-suppress, 15KV ESD protection
	Transmission distance	Maximum communication distance is about 1200m (at a low rate, with 120R resistor turned on)
	Transmission mode	Point-to-multipoint (up to 32 nodes). It is recommended to use repeaters for 16 nodes or more.
Operating environment	Temperature	-40 ~ 85℃
	Humidity	5%RH ~ 95%RH
Operating system	Win7/8/8.1/10/11, Mac, Linux, Android

Features:

• Extending USB to 4CH RS485 allows concurrent and independent communication for each channel
• Onboard TVS (Transient Voltage Suppressor), effectively suppresses surge voltage and transient spike voltage in the circuit, lightning-proof anti-electrostatic
• Onboard resettable fuse and protection diodes, ensure the current/voltage stable outputs, provide over-current/over-voltage proof, improve shock-proof performance
• Onboard RS485 output terminal 120R resistors, enabled/disabled via DIP switch
• Aluminum alloy case with oxidation dull-polish surface, CNC process opening, solid and durable, well-crafted

Product Interface:

Indicator Introduction
PWR	power indicator, lights up while the USB is connected and voltage is detected
ACT	The status indicator lights up green while the driver is detected.
RXD(1~4)	Blue RXD indicators light up when the device ports send data back (corresponding to 4 channels respectively)
TXD(1~4)	Blue TXD indicators light up when the USB port is sending data (corresponding to 4 channels respectively)

Pin Description:

• PE: Signal ground
• A(1~4): A(1~4) differential signal A+
• B(1~4): B(1~4) differential signal B-

Useful Link:

Waveshare 4Ch Industrial USB TO RS485 Converter

Package Includes:

• 1 x USB TO 4CH RS485
• 1 x USB type A to type B cable ~1.2m