Copyright © 2010 Future Technology Devices International Limited

6

Document Reference No.: FT_000132

USB-COM485-PLUS1 Datasheet

Version 1.21

Clearance No.: FTDI# 95

2 Installation

2.1 Example Applications and Configurations

2.1.1 Wiring

Insert the A-plug into an available USB Host or Hub port. Insert the B-plug into the B-receptacle on the

USB-COM485-Plus1.

DTE Pin Number

Signal Name

Expected Connect Signal

1

DATA- = Transmit/Receive

Data, negative polarity

Also Terminator 2

DATA-

Pin 2 of 120R Terminating Resistor. Only Required if the USB-

COM485-PLUS1 is the first or last device in a multi-drop RS485

System, to meet RS485 Termination Requirements.

2

DATA+ = Transmit/Receive

Data, positive polarity

DATA+

3

Terminator 1

Pin 1 of 120R Terminating Resistor. Only Required if the USB-

COM485-PLUS1 is the first or last device in a multi-drop RS485

System, to meet RS485 Termination Requirements.

4

N/A

N/A

5

GND = signal ground

GND

6

N/A

N/A

7

N/A

N/A

8

N/A

N/A

9

PWR = +5V DC output

PWR

Table 2.1 RS485 DTE to DCE connection

Figure 2.1 USB-COM485-PLUS1 Termination resistor