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USB TO RS485/RS422 CONVERTER
User Manual
Version 1.2
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I. Pre words
1. Please read the manual carefully.
2. Before using the USB TO RS485/422, please shut down host computer or
machine, and make sure the grounding system in good condition to avoid
damage from static surge.
3. The USB port only works with the USB port of host computer other than camera,
scanner, or printer, etc.
II. Introduction
USB to RS485-422 is the solution to adapt USB to RS485-422 signal system.
USB to RS485-422 converter comes with the following advantages:
1) to realize the communication between the RS485-422 device and the host computer
that does not have RS232 serial port (for example, Laptop)
2) to increase the transmission rate during RS485 or 422 communication, as USB
transmission rate can be up to 10Mbps
3) USB port can supply strong power need for the converter.
How USB to RS485-422 works?
1) Connect the converter to host computer.
2) Install the driver.
3) The driver will create virtual serial port, like COM3, or COM4, COM5, etc
4) For laptop computer without COM port, COM1 is usually created.
5) Application software chooses the created serial port to work.
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Please refer to the chart for the working process:
III. Application
USB to RS485 –422 usually works in these applications:
Industrial control automatic system, Barcode scanner, Palm, PLC&PLD, PDA( Win CE
system), Label printer, POS system, Data collection system, Access control system, etc.
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IV. Features
● USB port to serial port signal conversion.
● Regular voltage range of RS-485 port:-7V~+12V
● Support Windows98/ME and Windows2000/XP
● Support MAC Apple and Linux v5.0
● Compatible with USB v1.1 and USB CDC V1.1
● USB full-speed transmission
● USB bus self powered
● Support auto-handshaking agreement
● Transmission speed up to 57.6kbps in the distance of 1200m
● RS485-422 standard of TIA/EIA
● Support remote waking up and power management
● Support communication of multiple ends up to 32 RS485-422 equipment
TIPS
The transmission speed of USB to RS485-422 is decided by the distance.
The longer the distance, the lower the speed rate would be. (Table)
Distance
0~10m
300m
1200m
5000m
Rate (Max)
230kbps
115kbps
57.6kbps
9600bps
V. PIN OUT
RS485/RSRS422（DB9M pin）
DB9M
123456789
RS485-422
T-/D-
T+/D+R+R-
GND
VI. System requirement
Intel CPU compatible 486DX4-100 MHz or higher
One standard USB interface (4-pin)
Windows 98/Me or Windows 2000/XP operating system
VII. Driver installation
1) Put in drive disk
2) Find Pcomm26 folder, and run [Setup]
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Please follow up the pop up Windows to complete all the steps.
VIII. Driver removing
1) Put in the driver disk
2) Find folder [Dremover98_2K], and run the program
3) Follow the pop up window to remove the driver.
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