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Serial / RS232 / RS485 / RS422 / TTL Converter Products

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USB TO RS485 ADAPTER

Serialcomm - MODEL USB-485B

Sima S. Enterprises offers a diverse selection of high quality, high performance, USB to RS232 / RS485 / RS422 converter products from Serialcomm the choice manufacturer of low priced data communication products without sacrificing quality and reliability. Our bidirectional USB to serial converters are powered by very reliable signal processors featuring the autosensing feature and operate reliability and flawlessly without the need for flow control or software drivers.  All of our USB to RS232/RS485/RS422 converters come with optional terminal blocks for easy installation. All of our products are CE, FCC and RoHS certified by a reputable independent 3rd party testing facility and backed by our 30 day money back guarantee and 5 year warranty.

View all of our USB To Serial Converters >>


USB TO RS485 ADAPTER

WINDOWS 8/WINDOWS 7/VISTA/XP/98/
WIN CE/MAC/LINUX COMPATIBLE

 

30 Day Money Back / 5 Year Replacement Guarantee

SerialComm Model: USB-485B
Download Specs.   USB-485B.PDF

  DOWNLOAD DRIVERS

FREQUENTLY ASKED QUESTIONS

$29.95 - IN STOCK

 

DESCRIPTION

The SerialComm USB-485B is a high quality, high performance bi-directional port powered USB to RS485 converter in a 9 pin format.  It can convert any standard full duplex USB port to a RS485 signal in either direction via a COM port on the host computer. The USB to RS485 converter utilizes the FTDI chipset making it compatible with most computer systems and operating systems.  The unit is powered from the USB port and requires no external power.  It also features data direction auto-turnaround eliminating the need for flow control.. The USB-485B features a professional terminal block with optional selectable 120 Ohm termination via a jumper.  The USB-485B has a Type A female connector on the USB side and a DB9 male connector on the RS485 side.  The terminal block and software drivers are included with the converter.

The USB-485B uses the latest FTDI chipset and is fully compatible with Windows 8 32/64, Windows 7 32/64, Vista 32/64, Server 2003, Server 2008, Server 2008 R2, XP 32/64, 2000, 98Se, CE, Mac 8/9/X, Linux.

FEATURES

  • Plug-and-Play (hot-pluggable)
  • Adds one RS-485 port using one USB port
  • Operates from 300 to 1Mps baud
  • Optional terminal block included
  • Built-in optional selectable 120 Ohm termination
  • USB 1.1 and 2.0 compatible
  • Port powered - no external power needed
  • 3 feet (1m) cable for convenience
  • Transmit/Receive LED indicators
  • Data direction auto-turnaround - no flow control necessary
  • Internal 128/385 byte TX/RX buffers
  • No IRQs, IO, DMA required. No IRQ conflicts
  • Supports remote wakeup and power management
  • Easy to install included drivers
  • Built-in surge and static protection
  • 5 year manufacturer's warranty
  • RoHS, CE and FCC certified
     

SPECIFICATIONS

COMMUNICATION
STANDARDS: USB 2.0 and 1.1 Standards - RS-485 Standard
BAUD RATES: From 300 Baud To 1 Mbps
CONNECTOR TYPES: USB Side: Type A Female and RS-485 Side: DB9 Male or 3 Position Terminal Block
DISTANCE: USB Side: 10 ft (3m) and RS-485 Side: 4000 ft (1.2m)
LED INDICATIONS: RS-485: TX (Red) and RX (Green)
DRIVERS: FTDI drivers are included in package
ELECTRICAL
POWER SOURCE: Port Powered From USB Port
CURRENT CONSUMPTION: Less Than 100 mA
STATIC PROTECTION: 15KV Electric Static Discharge (ESD) Protection
SURGE PROTECTION: 600W/Sec Surge Protection
CONVERSION IC: FTDI FT232RL - For further information from FTDI regarding their IC; follow this link.
MECHANICAL
WEIGHT: 2.7oz (76 grams)
DIMENSIONS: RS-485 Housing Without Terminal Block:
1
.98 X 1.43 X 0.72 in (50.2 X 36.2 X 18.2 mm)
RS-485 Housing With Terminal Block:
3.03 X 1.43 X 0.72 in (76.9 X 36.2 X 18.2 mm)
ENVIRONMENTAL
OPERATING TEMP.: 14ºF to 140ºF (-10ºC to 60ºC)
OPERATING HUMIDITY: 5% To 95% - No Condensation
QUALITY
PRODUCT SAFETY: CE, FCC and RoHS Conformance Certified
RELIABILITY: Low Failure Rate - 99+% Reliability Since Inception
WARRANTY: 5 Year Replacement Warranty
     

PINOUTS
 

 

RS485 SIDE

SIGNAL 485- 485+ GND
PIN # 1 2 5
FUNCTION D- D+ GND

DB9 MALE OR 3-WAY TERMINAL BLOCK

          

 
     

TERMINATION GUIDE
 

The USB-485-B terminal block has an optional built-in 120 ohm termination. 120 ohm termination is an advanced feature typically used to reduce noise and signal reflections. It is recommended to use 120 Ohm termination if you are exceeding 600 feet in distance, 19.6K baud or in a noisy environment. The terminal blocks are shipped with 120 Ohm termination off but can be turned on using the convenient jumper setting located on the left bottom of the terminal block.
.

3 Position With 120 Ohm Off

 

3  Position With 120 Ohm On

 

 

     

APPLICATIONS

USB to RS-485 Converter

FIGURE 1: EXTENDING THE USB DATA DISTANCE


USB to RS-485 Adapter

FIGURE 2: MASTER / SLAVE MULTI-DROP CONFIGURATION

 


TROUBLESHOOTING INSTRUCTIONS

 

Using two USB-485B units:

Check that all connections comply with the connection diagrams. Perform a loop back test on two units: Connect the D+ to D+ and D- to D- on the USB-485B RS-485 ports. Connect the two USB connectors to the USB ports of the computers. Install the USB-485B FTDI driver on the computer per instructions provided. Running hyper terminal programs on both PCs, send ASCII characters to the USB-485B converter from one PC port, and check that the characters are received at the 2nd PC port. Repeat the test in the opposite direction. This tests that the transmit and receive functions of both USB-485B units are working properly. When there is constant RX data you should see the GREEN light blink.  When there is constant TX data you should see the RED light blink.

Download FREE FULL VERSION AccessPort Advanced Serial Monitor, Simulation and Data Analysis Software Tool.  This software tool is great for testing converters.  Supports Windows 98/XP/VISTA/WIN 7.  DOWNLOAD SOFTWARE AND USER MANUAL

 

 


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