USB-COM485-PLUS1 FTDI, USB-COM485-PLUS1 Datasheet - Page 3

• Manufacturer Part Number: USB-COM485-PLUS1
• Description: Interface Modules & Development Tools USB to RS485 Convrtr Assembly 1 DB9 Port
• Manufacturer: FTDI

Specifications of USB-COM485-PLUS1

• Interface Type: USB, RS-485
• Data Bus Width: Serial
• Operating Supply Voltage: 5 V
• Product: Interface Modules
• For Use With/related Products: FT232R
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: USB-COM485-PLUS-1

1.2
The USB-COM485-Plus1 uses three LEDs to indicate a valid link as well as data traffic according to the
following table:
Table 1.1 LED Description
1.3
Figure 1.2 USB-COM485-Plus1 Block Diagram
1.3.1 Block description
USB B Client Connector
This connector provides the interface for connection to a USB Host or Hub port. The maximum cable
length is 5 meters, according to the USB 2.0 specification.
FTDI FT232R
The FTDI FT232R provides the USB-to-Serial conversion. Operating system device drivers are required in
order to work with the FT232R to provide the Virtual COM Port serial functionality.
RS485 Level Shifter
The RS485 level shifter converts the signals provided by the FT232R into the voltage levels required by
RS485 devices.
DE-9P Connector (Male)
The DE-9P connector is configured in an industry standard (TIA/EIA-485) pin-out to provide connection to
RS485 peripherals through standard cables. See section 3.1.2
LED Color
Connector
USB B
Client
Yellow
Green
LED Description
Block Diagram
Red
Function
Enumerated
RxD Activity
TxD Activity
USB Serial Bridge
FTDI FT232R
Copyright © 2010 Future Technology Devices International Limited
Description
ON when USB-COM485-Plus1 is configured and ready
Flashes when data is transmitted from the USB-COM485-Plus1 to the
attached RS485 device
Flashes when data is transmitted from the attached RS485 device to the
USB-COM485-Plus1
Level Shifter
RS485
Connector
DE-9P
Document Reference No.: FT_000132
USB-COM485-PLUS1 Datasheet
Clearance No.: FTDI# 95
Version 1.21
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